n.
Function: intransitive verb
Date: 1932
1 a : to spend time idly or foolishly ― usually used with off < goof ing off instead of working> b : to engage in playful activity ― usually used with around < goof ing around after school>
2 : to make a usually foolish or careless mistake : BLUNDER ― often used with up
transitive verb : to make a mess of : BUNGLE ― usually used with up < goof ed up the assignment>
– goof on
slang : to make fun of : KID , PUT ON <you're goofing on me, right?>