Actual meanings:
TC Bye = Shut up and Get Lost !
Ahaan ! = I'm really not interested in your stuff baby
Hmmmm = So why are you telling me all these !
Hey what's up = I'm bored, talk to me please..
Cool = I've heard enough of you loser !
OK = whatever! Don't eat my brain now
Lol = Trust me, I have absolutely nothing to say !! :P
