GY: obtuse, annoying, a pain in the arse
K: to hit (我真想K他!) - I think this might just be a mainland thing - anyone confirm?
AV: Also means an X-rated movie (from English via Japanese, I think: Adult Video)
LKK: an old fart (from Taiwanese)
There are also text/MSN abbreviations such as:
TMD: 他媽的 (tāmāde!) shit!
GG, G8 and B: I’ll leave you to work these out by yourself. Naughty words I’m sure I shouldn’t know…
Brendon: When I hear QQ it’s about food - especially pliable chewy things like muaji. Not saying you’re wrong, I’ve just not seen it as “cry” before.