whoopsy noun 3adjective 1exclamation 1forms 3 noun3 •(informal) A mistake or blunder. •(UK) Urination, or a piece of excrement.Ooh, Betty, the cat's done a whoopsy on the carpet! •(slang, offensive) A homosexual man, especially one with camp mannerisms. adjective1 •(informal) Woozy; disoriented; queasyShe felt headachy and a little whoopsy in her stomach. — 1999 exclamation1 •(informal) Whoops; oops. formswhoopsies · more whoopsy · most whoopsy