A mug that is used for beer.
I feel like having beer, let me get my beer mug.
When two males clash the tips of their penises together at simultaneous orgasm, causing the illusion of two full beer mugs being hit together causing foam to splash out.
Male#1: HEY! I think I saw Lance Armstrong riding his bike back there on the road.... I'm going to go back and try to talk to him.
Male#2: Got a man crush on lancey poo? Why don't you go beer mug with him.