The finger gun is a hand gesture in which a person uses their hand to mimic a handgun, raising their thumb above their fist to act as a hammer, and one finger extended perpendicular to it acting as a barrel. The middle finger can also act as the trigger finger or part of the barrel itself. Also, an optional clicking of the fingers can be included when forming the "gun" as to emphasise the gesture.

It may be used after a situation in which its user has successfully completed the "too slow" variation of a high five.

It is also sometimes used by placing the “gun” to the side of one's own head, in one's mouth, or under the chin, as if committing suicide, to indicate a strong desire to be put out of one's misery, either from boredom or exasperation, or to express one's dislike for a situation. It can be used as an insulting gesture, as to suggest that another person's brain should be blown out of the back of their head. Nonetheless, it can also be used in a positive sense, as a way to say “hey” or “what’s up” to friends or acquaintances.