goof in English

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expr. goof off, (Slang.) to waste time, idle; loaf.
Ex. Those who goof off must face the weekly embarrassment of the conference (Harper's).

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goof, verb, noun.
(Slang.)

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noun 1. a mistake; blunder.
Ex. ""Between you and me,"" he said, ""it's a goof. They were so busy fixing up everything else, they forgot about putting in a clock"" (New Yorker).
2. a simpleton; fool.

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v.i. to make a stupid blunder or mistake; blunder; err.
Ex. All I need to do is goof once--just once--and I lose my chance to make Corporal (Harper's).

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v.t. to mess up completely; fumble; do all wrong.