Butt Violin 

When you take a coat hanger and move it between someone's butt cheeks as though you were playing a violin.

"4 guys came out of no where and started giving me butt violin."

Butt Violin by the hue bearer January 22, 2015

violent butt fuck 

to vishously fuck the butt while dumping the womans head in the toilet.

violent butt fuck by Kevin October 12, 2003