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2.
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..."
by HangDongMan December 01, 2011
 
1.
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?
by Dr. Mantis Toboggan, M.D. December 13, 2011