goof (2): make a mistake.
goof off (3): waste time.
goof-off (4): someone who wastes time and isn't serious.
goof up (5): make a mistake.
goofy (6) : silly.
2.I really goofed on the test today."
3."Stop goofing off and help me clean the house!"
4."A goof-off never does well in school"
5."Oh no! I really goofed up!"
6."Kids always make me feel goofy!"
1. An incompetent, foolish, or stupid
2. A careless mistake; a slip.
goofed, goofing, goofs verb, intransitive
1. To make a silly mistake;
2. To waste or kill time.
To spoil, as through clumsiness;
bungle: goof up a job.