When you get stabbed in the belly button by a small shank or a large katana. It can also be the jizzing onto a females belly button...
by (>)`-`(>) June 23, 2008

A knife job is when a girl takes a lot of knifes or swords and literally tares her pussy apart. Also some guys will do this to a lot of girls and turn them into a hoe floor.
by Homieslice of the Negro September 3, 2016

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
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
by deuxgatos January 21, 2011

Similar to a sword fight, however both participants penises are very small, thus knives instead of swords
by illweedsesh January 28, 2009

by Steve Wilhite May 13, 2005

Dave. "How did you get on with that bird you picked up Kev? Did u give her a good filleting"
Kev "Yeah I boned her with my fillet knife 4 hours solid!"
Kev "Yeah I boned her with my fillet knife 4 hours solid!"
by nutman17 May 25, 2007

by Elaxist May 25, 2010
