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To expose one's penis
Charlie: "It's like the biggest movie in America."
Dee: "Plus, I hear the guy hangs dong and I'm very interested in seeing that."

Do you like to hang dong on the trolley?
von Dr. Mantis Toboggan, M.D. 13. Dezember 2011
the act of publicly exposing the male genitalia
"Did you see me hang dong on the bus on the way to thunder gun?"

"Yeah, it looked like a piece of chalk and a penny was hanging out of your pants..."
von HangDongMan 1. Dezember 2011