knife ass 

The approximate 2 - 10 seconds of immense pain inside of a female's anus that comes and goes without warning. It feels like - more or less - a knife in one's ass.

Girl 1: *starts to wince in pain whilst squirming in chair*
Girl 2: Are you alright?!
Girl 1: *stops* Yeah, I just had a massive case of knife ass
Girl 2: Aw yeah I hate that

knife ass by deuxgatos January 21, 2011

ass knife 

when your skateboard gets between you and the ground when you fall and catches you in the junk.

Argh! I missed the rail and got ass knifed!!

ass knife by Slyder February 17, 2005

Knife Yo Ass

A threat to cause pain using a knife or blade.

"you best step before I knife yo ass!"

Knife Yo Ass by DayDay January 4, 2004

big ass knife 

a big ass mutha fuckin knife, as in a big ass blady thingy! kill dem snakes on da plane

Dat be a big ass knife nigga!!!

big ass knife by bob the reindeer knife masacre September 30, 2013

knifeass 

The feeling of a hot, serrated steak knife wedged up your asshole after a long, violent session of explosive diarrhea.

I have the worst knifeass today after drinking that McDonald's iced coffee.

knifeass by knifeass March 11, 2009