taking a shit so long that one is unable to flush it down the toilet, thus requiring a butter-knife to cut it into smaller pieces in order to flush properly.
Dude, I've been holding it in all day and just dropped one hell of a butterknifer.

Gary, you really shouldn't be eating a box of granola bars a day, you might clog your toilet with all the butterknifers you probably take.

That butterknifer is over 14 inches long! Damn!
by Rockit December 16, 2005
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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
The wife likes getting the butterknife when we have sex!
by Freddyedge7 December 20, 2016
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A word that we tried to look up on urbandictionary while we were high.
Nathan! *Snaps fingers* Look up butter.... knife.
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The act of spreading ejaculated semen on a females tits using your cock. Akin to spreading butter on rolls.
I unloaded my cum all over her huge tits, then started butterknifing those knockers.
by joebobusa22 April 10, 2010
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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 5, 2009
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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 October 23, 2005
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The act of spreading rumors; To spread a rumor
I heard that fucka was butterknifing about you and Eva...
by Unko June 21, 2006
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