goof /ɡuːf/noun 4verb 2forms 3phrases 4 noun4 •(US, informal) A mistake or error.I made a goof in that last calculation. •(US, informal) An error made during production which finds its way into the final release. •(US, informal) A foolish and/or silly person; a goofball.Your little brother is a total goof. •(Canada, slang) A rapist. verb2 •(US) To make a mistake.It's my fault. I goofed. •(US) To engage in mischief.We were just goofing by painting the neighbor's cat green. formsgoofed · goofing · goofs Phrases with goof goof aroundTo fool around. goof offTo dawdle, lollygag; to waste time aimlessly or engage in idle activity or inactivity. goof onTo mildly mock, tease, make fun of; usually implying good-natured fun more than biting sarcasm. goof upTo make a mistake.