what does BWT stand for?
Do you mean BTW?
If so, it stands for By The Way.
Depends on the context. Here’s a list.
sorry about the typo.
oh, well, WTF.
Or … WFT, as th’ case may be. (sorry!) 
yarr…
Interesting how some web sites have their own lingo… I’d never seen ‘OP’ or ‘IANA(whatever)’ until I came here, and I was pretty confused by them for a while. As a language purist, I have to say I think we’d be better off if posting was more acronym- cliche-free. 
BUT: as a Simpsons fan and cliche-hater, I’d like to propose a new abbreviation. Props to whoever figures it out first.
HITMYMRMFSFA
Bacon Wettuce Tomato? (That’s gonna bother Eve.)
Hi, I’m Troy McClure. You might remember me from such films as…
Their own lingo? These date back to well before the SDMB and can be found on just about any active message board.
Haj
Hey, could be. I admit I occasionally spend my time other places, but I’d never seen those or a couple of others before.