IHTP 

An acronym for the phrase, "I Have To Poop".

Dude, I gotta get off the phone because IHTP.

IHTP by DMBtunes July 13, 2007

ihtpp 

i have to pee pee

George: Hey man, brb, ihtpp
Mark: You have to what?
George: I have to pee pee, same thing as ihtp
Mark: ...Oh... k man!

ihtpp by yomamasaidso April 14, 2009