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1.
Jizzing on your index finger and RAMMING it up the chick's ass.
He finger-bunned that bitch good! He got jizz on his finger though.
by Brother Blumpkin April 28, 2005
 
2.
A bun that is used to finger to substitute the fingering of an asshole. Typically filled with BBQ sauce to increace pleasure and realistic fingering environment
I couldnt find a guy, so i used a finger bun
by Fingerbunking October 12, 2008