PMBAHTD........... Pinch My Bum And Hope To Die
TMT! ............ Tickle My Testicles! (i.e. I do not believe your last statement)
BO................. Bugger off!
BRB.................. Man: be right back, darling, I need 30 seconds to go for a pee!
BRB.................. Woman: be right back, darling, but only after you've given up waiting over 30 minutes for me!
IMHO ............... I am a total lying shit, and I've just told you a whopping porkie pie!
IMHO ................ I'm right, but your opinion sucks!