busting guts 

Particularly vigorous intercourse.

Dude, I was totally bustin' that chicks guts!

busting guts by jaydawg February 19, 2005

Bustin' Guts 

1. When a man and a woman are engaged in sex, and the man's penetration is deep enough to cause physcial discomfort to the woman.

Shelly said that Frank fucked her so deep that he blusted her guts.

Bustin' Guts by thermo January 14, 2005