—v.i. 1. to blunder; make an error, misjudgment, etc.
2. to waste or kill time; evade work or responsibility (often fol. by off or around): Exam week is not a time to goof off. We goofed around till train time.
—v.t. 1. to spoil or make a mess of (something); botch; bungle (often fol. by up): You really goofed up the job. 2. goof on,Slang.to tease, ridicule, or mock; make fun of.
—n. 1. a foolish or stupid person.
2. a mistake or blunder, esp. one due to carelessness.
3. a source of fun or cause for amusement: We short-sheeted his bunk just for a goof.