When you get a sweaty gym sock and place it upon your penis and then masterbate, filling the sweaty, yet stinky, sock with your special juice. Then you prance around naked and smack random people's faces with your fresh batch of Mollysock.
Derek: Damn. Steve just Mollysocked Justine and now she has herpes of the mouth, eyes, skin, and nose.
Rick: I know. He is such a badass.