HBF Share definition Flag acronym for Hand Butt Fuck, where a man or woman inserts fingers, and eventually the entire hand, into one's ass for pleasure. Jenna kept trying to HBF me last night when I was sleeping, SO annoying, I had work in the morning! HBF by AlexJenna March 19, 2008 0 0 Get merch Get the HBF mug. Buy Now — $32.95 See more merch