When an individual licks the tip of their two fingers, straightens their mustache with said fingers and proceeds to insert these fingers inside of a vagina while licking the clitoris.
A friendlytaunt of gesture made to a friend for no other reason than you can and its funny.
Put your index finger sideways under someones nose and say "mustache finger?" if you succeed and get them you will win bro points... if they somehow avoid your attempt they get bro points.
It is said of the situation where a person has the bad luck to make contact with his testicles against an undefined surface or object, intentioned or not.
Given the nature of the word, it is more appropriate to design cases where the interaction is made with a moving object, for example, a ball.
Although it is extremely painful for the victim, it tends to be considerably funny to people who witness it.
Today in the baseball game the pitcher took a nutshot; the baseball hit him in the nuts.
Man, I just watched the funniest nutshot video ever.