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The hinus is the skin between your butt cheeks, also it can be the skin right before your back that is between your butt crack.
Dude i got a wedgie the other day and it was all the way in my hinus.

Dude! My hinus itches really really bad!
by I AM GAY May 16, 2007
shorten version of hello you, hi how are you or hey you.. mostly used in chat box (msn,skype,yahoo)
online chat box

Me: Hinu

Friend: hiya
by sum1weirdo August 16, 2011
sumone who is really arrogany. An arsehole
That guy today was a hinus . . he pissed me off!
by Steven Marks August 30, 2006