A move preformed when jumping into a pool. No specific movement involved, rather flailing of the limbs, and yelling "BUTTERKNIFE!!". Originally created as a subdivision of the manuver The Jack Knife.
by asdubgiaudgfiua December 24, 2005

When your doing your girl doggie style. You pull out and cum on her asshole. Then spread it with your dick from ass to pussy and back up
by Freddyedge7 December 19, 2016

by MONO-I cant spell the rest June 07, 2003

The act of spreading ejaculated semen on a females tits using your cock. Akin to spreading butter on rolls.
by joebobusa22 April 10, 2010

Sneaking up behind someone and rubbing the thumb-side of ones hand in a smooth upward motion between said person's butt crack.
by ALB_B November 05, 2009

by Unko June 21, 2006

I'm Gonna End My Life..Gotta Go Find A Butterknife...Cut...Cut...Cut...Drip...Drip...Drip...Bleeding...Moans....Thud...Hits The floor Dead! All Because Of A Butterknife I Am Dead!!!
by Tatume05 June 17, 2003
