The Handgun (Verb). To insert both your index and middle finger into a woman's vagina and place you thumb on her clit, thus making a handgun shape with your hand.
A bright yellow, vaguely dog shaped rapist abomination of science and software piracy, handbanana is commonly known to prey on large, hairy, pale, pockmarked asses in compromising positions in many backyards across New Jersey.
If you happen to encounter a handbanana, and are asked if you're willing to "back that up"; ALWAYS SAY NO.