Definition of Goof

Verb: goof goof

Commit a faux pas or a fault or make a serious mistake
- drop the ball, sin, blunder, boob
(informal) spend time not doing much; fool around
- goof off

Noun: goof goof

A man who is a stupid incompetent fool
- fathead, goofball [N. Amer], bozo [N. Amer], jackass, goose, cuckoo, zany
A person who amuses others by ridiculous behaviour
- clown, buffoon, goofball [N. Amer], merry andrew [archaic], droll [archaic]