To masturbate aggressively, usually with a penis.

Synonyms:
Beat One Out
Beat the Meat
Beat It (yes Michael Jackson wrote a song about masturbating)
Beating the Sausage
Going to Causeway
PublicSafety: Open up! There's been a noise complaint.

Dug: Sorry officers, I was just Beating One Out.

PublicSafety: Carry on.
by definitelynottheghostofmichael October 29, 2018
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