Actually the practice is already commonplace among geeky-nerdy types. Especially over voice-comms like Ventrilo. When I was playing WoW and using Vent, most people would say “lawl”, or even “el-oh-el” with their speaking voices.
Some of the more colorful terms of abuse you run into on the Internet are (fortunately?) never encountered in real life; notably “hambeast”, “asshat” and “fagtard.”
Nor have I heard anyone in the flesh use “fail” as a noun, like in the 'Nettism “a puddle (pile, bucket) of fail”.
Interesting - I say it exactly the same as “pawned”.
In my head, that is. Never said it out loud.
I frequently use “Meh” in real life, along with “Lol” (as in “I Lol at your pathetic attempt to get the DVD player working”, not in place of actual laughter), “QQ”, and “pwned” (pronounced “owned”). They’re very useful phrases, IMHO.
I also use Phonetic Acronyms too, largely “Whiskey, Tango, Foxtrot?” and “Foxtrot, Foxtrot, Sierra!”. Very useful at work, I can tell you. 
My brother and I say ‘pwowned’.
Okay - I totally think anyone who says “O M G” versus “omigod” out loud when speaking just comes off as pretentious.
us true geeks are identified by our natural speech patterns, not some affectation!
However, I have adopted certain words and phrases outside my WoW addiction that could probably be equally annoying:
“epic fail”
“crafted” et al (for reference, I highly recommend you watch “Watch the Guild” - 5 minute webisode series.)
“phat lewtz”
In Dutch “Lol” means fun…so you can kinda use it in conversation
Pretty much every single expression used in this daft but very funny WoW video…ROFLMAO! 
…think that has just about ALL of the gaming acronyms in it
Well, I always thought that “Epic Fail” had pretty much entered the common vernacular (even my Mum knows what it means, and she’s so computer illiterate she almost uses correction fluid on the monitor!).
I confess to using “Phat Loot” as a useful way of describing “Getting Lots of Money Or Cool Shit”, and have also used “Shift Click Loot” in conversation at work to describe taking all of something from a particular area (“Can someone Shift Click Loot the cheap MP3 players from out the back and put them in the Bargain Bin at the front of the store?”).
Describing oneself as being “Le Tired” is also a great way of saying “I really can’t be bothered”, too.
Perhaps I’m more influenced by gaming culture than I realise… 
In our house, we really do use “Meh”, “pwned” (pronounced “powned”), WTF? (Very useful when we want to convey the emotion but there’s a child about) and “OMG ponies!” although this last is most often used between me and my 17YO when we desire to express an extreme level of, well, OMGness.
Oh, also “epic fail”, as in, 'well, there was this one time I tried adding leftover corn to the meatloaf? Epic fail!"
The fact that we actually use some of these is probably influenced by the fact that I have kids/teens/young adults in the house.
One more thing, somehow or other, when my 17YO and I leave each other notes (on the computer using NotePad), we always do them in “kitty pidgin” (The last note she left me was something like: Ohai. U wakez me up at 8 for goin to skool. I is needin more bukz today, plzkthx") and each of us (I’m almost embarrassed to admit this) has our own “LOLCats” name. She is ‘AriehKitteh’ and I am “Mama Kitterz”)
Is it silly? Yeah, it is. But it seems like little “in-jokes” help keep you connected to your family, and when your kid is 17, it never hurts to stay a little more connected. Plus it’s fun. 
Sorry for the hijack, but I’ve seen this word a couple times, and I’ve no clue what it means or refers to. And obviously, my dictionary isn’t going to help.Someone cares to explain?
Yeah, those people suck.
It’s a misspelling of “owned”, due to ‘o’ and ‘p’ being so close together on the keyboard, that has caught on.
Normally used in gaming in the sort of “wow, you totally pwned that guy!” way.
My brother and I have a phrase which phonetically is equivalent to: “2 oh vo sag”
but in reality it’s just “out of gas” backwards. we did a lot of backwards speak when I was a kid.
If someone was helping themselves to too much mashed potatoes, they were a “tell gip” (piglet)
If you were acting foolishly you were a “dip putz” (stupid - a word my mother wouldn’t allow us to say)
Etc.
/hijack
the other one i’ve used is “QQ more”
No it’s not. 
tuo fo sag = out of gas.
The words are backwards, not the whole sentence. Sorry - we like to confound y’all that way. Remember, we would have been backwards translating as we went along - not whole sentences at a time.
I sometimes use “full of fail” or “full of win”. I also sometime use “made of awesome”.
Slight hijacki: I once saw a WoW guild that was gnome-only. It was called “My Little Pwnies”. This cracked me right up.
I’ve probably used most of these out loud, though I think only used pwned in an ironic manner. Meh is most common around our house. A lot of MMO gaming vernacular has entered my common language, especially in tabletop roleplaying. We regularly use words like aggro, kiting, mobs, drops, and vendor trash in D&D now.
Huh. Guess it worked!
For the OP, I’ll nominate “whinging,” but that’s probably because I’m not British. Hell, I don’t even know how you’d pronounce it, but it’s an awfully stupid word.
There are still a lot of people out there who aren’t Internet-savvy, so I make it a point not to use any words they wouldn’t understand (unless I’m talking about computers).
There’s also the fact that most of them (“el oh el”) sound incredibly cringeworthy to my ears to the point where I’m embarrassed for the person who said them.