When you're going in to give a "fist bump" to someone and instead of bumping their fist, you completely cover their fist with your open hand and say "Mittens!" in a very high pitched voice.
Tyler and Reed walked up to a couple of cute chicks at the mall. One of the girls makes a smartass comment to Reed, and Tyler says "hell yeah, give me a pound." When the girl puts out her fist, Tyler covers her fist with his open hand and cries out "MITTENS" in a shrill little voice. The cute chick has been "Mittens'd"
by Shadoe Swim March 08, 2010