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.
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