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1.
When a man or woman let's someone ferociously fornicate with their colonoscopy bag hole. In turn, literally fucking their guts out.
-"Hey Greg how much for a gut fuck?"

"Oh fuck, uhm..... $300?"

-"Alright sounds good to me"

"Try to stay away from my liver"

-"I can't control it once it's in, it does what it wants...."
by FomeDe January 10, 2012
 
2.
to have intercourse with a puncture wound in the abdemon.
she loves a good gutfuck
by Phil-thy August 27, 2007
 
3.
When either a male or female is fucked so hard, afterwards their guts/insides/uterus hurt really bad.
girl a: dang last night was definetly a gutfuck, my insides hurt

girl b: yeah, gutfuck for sure
by unknown June 15, 2006
 
4.
to fuck a female so hard and long that in essences you are fuckin thir guts but can only be dun with a above average dick!
jack fuck jill so hard he gut fucked her in to orgasmic tremors of pain as his dick gut fucks her!
by wickedjuggalonate April 28, 2009
 
5.
To shoot or stab in the guts especially in a way that is messy or resembles sexual intercourse.
1. Dude! I just slipped my knife into this dudes' guts then slid it in and out slowly until he was totally gut fucked.

2. The farmer gut fucked his prize cow, with a shotgun, at point blank range.
by Anonymous Vomitus November 24, 2009