When people annoy you constantly, despite your threat to beat the crap out of them. This type of person has a death wish, as if they WANT to be killed by you.
Zach: AHHH I'm so stupid i wanna be an effing super hero hahahahahahaha WHEEEEEEEEEEEEEEE!
Girl: Shut up Zach.
Girl: I'm gonna beat the shit out of you
Zach: *Continues to mime.*
Girl: DUDE DO YO HAVE A FUCKING DEATH WISH?
INAH is used in IM conversations, and means, "I need a hug".
Ash: me so sad INAH so bad!!
Sexii Dude: *sends little hug emoticon*
Ash: Thx!!! UR the bestest!!!