I tend to use britishisms a lot, though I’m not British. (I have some British ancestry though) “Bloody hell” gets used a lot. Lately, ever since I saw that aussie car commercial, I’ve been saying “Bugger” and “Bugger me” a lot (in an aussie accent, of course).
“Smeg” was a favourite of mine a while back, but I was incapable of saying it without trying to do a David Lister impression.
I’m not at all sure why I use “puppies!” and “Oh, puppy poop!”… but they tend to diffuse my irritation a bit, so I like 'em. Prolly 'cause I like puppies…
I’ve been experimenting with “Wibble” as a curse word lately. It’s working rather well, actually.
*Oh, Wibble!
Stupid Wibbling thing!
That’s the biggest load of Wibble I’ve heard in years!*

Wibble- the most versatile word in the English language- or indeed, any language! 
It doesn’t, and it usually brings a laugh.
“Great skyclad Unitarians!”