noun

1. A mistake or error.

   “I made a goof in that last calculation.”

2. A foolish and/or silly person; a goofball.

   “Your little brother is a total goof.”

3. A child molester.

Synonyms: blooper, boo-boo, error, faux pas, fluff, gaffe, lapse, mistake

verb

1. To make a mistake.

   “It's my fault. I goofed.”

2. To engage in mischief.

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