1. Used in the saying "Don't Mullens Yourself", meaning not to overly stress out, flip out or "mess" oneself up.
2. "Do The Mullens" - pop your collar, strike a Japanese/Myspace-style backwards peace sign pose, pout and tip your hat (if wearing one) while smoothing your fringe with your free hand. Kind of like the new "Do The Bartman."
3. To ejaculate into someone's eye.
1. Guy 1: "OMG AS IF YOU GUYS WENT TO TACO BILL WITHOUT ME! WTFFFFF!"
Guy 2: Dude...Don't Mullens Yourself.
2. (while photo is being taken)
"EVERYBODY DO THE MULLENS!"
(all simultaneously pop collars if wearing them, pout girlishly, and strike Myspace-style poses.)
(on a freakishly cold day)
"Shit, it's cold. I'm doing a Mullens." (pops up collar to prevent neck getting cold.)
3. (person gets shampoo squirted in their eye)
Person 1: "OWW! I think I just got Mullensed by that shampoo!"
Person 2: "Shit, that's gotta hurt."
Guy 1: "Man that chick is so fly."
Guy 2: "Would you Mullens her?"