Definition of "goof" in English

noun

1. (US, informal) A mistake or error.

   • I made a goof in that last calculation.

2. (US, Canada, MTE, informal) A foolish and/or silly person; a goofball.

   • Your little brother is a total goof.

3. (Canada, prison slang) A rapist.

verb

1. (US) To make a mistake.

   • It's my fault. I goofed.

2. (US) To engage in mischief.

   • We were just goofing by painting the neighbor's cat green.