oof /uːf/noun 3exclamation 2forms 1phrases 2 noun3 •A sound made in pain, as when expelling air after being struck.The soldier on the ground clutched his head and then his stomach and gave an "oof" of pain. — 1966 •(Internet, slang) Something cringeworthy, or which arouses disappointment; often used in conjunction with the qualifier big.That is a mega oof. •(slang, old-fashioned) Money.Burlington Bertie's the latest young jay He rents a swell flat somewhere Kensington way He spends the good oof that his pater has made Along with the Brandy and Soda Brigade. — 1900 exclamation2 •A sound mimicking the loss of air, as if someone's solar plexus had just been struck.Whap, Biff, Ooooof, Sock, Pow, Zok! Batman is back. Gotham City is again leaving its law and order in the hands of a man who wears plastic underpants over his tights. — 1989 •(slang) Synonym of ouch (“expressing sympathy at another's pain, shock at a high price, etc.”)."Oof, you just lost a lot of progress. That's a real frustration, a real punch in the gut." — 2017 formsoofs Phrases with oof feathered oof-birdAny large, plentiful source or supplier of money. oof-birdAny source or supplier of money.