a. A person or animal that displays stupidity or does something disappointing. A different and possibly more polite way to call a friend, pet, or stranger a dumb ass, shithead or fool.
b. Slang for penis.
"I drove back across town because some dingus didn't take the damn ink tag off my new shirt."
"I don't chase my wife around naked in the house anymore. Last time I bruised my dingus."
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