Top definition
When you're eating butterfingers and you take one and stick it in a girls pussy while you finger her ass hole, with your "B Finger."
"Dude, last night I was so drunk that instead of eating that Halloween candy I just B Fingered the fuck out of Kelly!"
by i<3thekillers December 02, 2009
Get the mug
Get a B Finger mug for your barber Trump.