Definition of goof

< gooey

goofball >

goof    (gf) KEY  Slang

NOUN:

1. An incompetent, foolish, or stupid person.
2. A careless mistake; a slip.

VERB:
goofed, goof·ing, goofs
VERB:
intr.

1. To make a silly mistake; blunder: goofed up by turning right instead of left.
2. To waste or kill time: goofed around at the mall.
3. To tease or make fun of someone: goofed on her younger brother.

VERB:
tr.

To spoil, as through clumsiness; bungle. Usually used with up: goof up a job.

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ETYMOLOGY:
Possibly alteration of dialectal goff, fool, from obsolete French goffe, stupid