supercock noun2 •(slang, vulgar) A large penis.I would say that a thickness of 2 ins diameter and a length of 11 ins would count as a supercock. — 1973 •(Philippines, old-fashioned) A formidable gamecock.[…] You know, I could understand your anxiety if you were betting on just any rooster. But when you wager on a supercock like this, why, it's just like putting your money on San Miguel." — 1959 formssupercocks