A finger going up the anus of a male being fellated (gay or straight).
Ed loved it when Sally gave him butterfinger during fellatio.
by BlackMamba23 August 01, 2008

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What an individuals finger is after inserting it into the female sex organs.
"Hey honey, want a Butterfinger?"
by Cejay December 06, 2006

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The act of sticking your penis in the opening of the bottom of a popcorn bucket and surprising your date. This results in a very messy and sticky handjob.
Last night, Jake gave me a butterfinger during Titanic!
by Salt Lick October 25, 2010

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The resultant covered penis of heavily lubricated anal sex, looking much like a finger coated in butter.
After I was done with her I had a huge butterfinger, so I smacked her on the forehead with it a few times to get some of the shit off.
by smoog July 17, 2006

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when you take butter and put it on your fingers and shove them up a girls vagina.
i butterfingered that whore , she was buttered
by PolishWhore August 04, 2010

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To lube your finger up with butter and then insert into the rectum of another individual.
I'd like to butterfinger her!!!!!
by The Lord of the Butterfinger June 06, 2007

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When one person sticks his/her finger up another person's butt in an awkard situation.
I was trying to order my ice cream when Hood gave me a "butterfinger"!
by Gadman June 10, 2009

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