From Longman Dictionary of Contemporary Englishgoof off phrasal verb American English informalGO TO/ATTEND#WORK HARD#to waste time or avoid doing any workHe’s been goofing off at school. →goof→ See Verb table
Examples from the Corpus
goof off• Hey you two! Quitgoofing off and do some work!• Anyone who does consistently good work doesn't need to worry about occasionally goofing off on the job.