iswtdt

this means "i still want to die, tho" so you should probably stop looking at this and attend to your friend

gregg: are you feeling any better?
dan: ye, i guess. iswtdt
gregg: oh..

are you titting me

when you run out of funny shit to say when something happens, so you just say this

mark: dude, stacey just fucked your cousin!
chad: are you TITTING me?!?
mark: heh never heard that before lol nice