goofing on

Verb

goof on (third-person singular simple present goofs on, present participle goofing on, simple past and past participle goofed on)

1. (informal, transitive) To mildly mock, tease, make fun of; usually implying good-natured fun more than biting sarcasm.
   • The students were goofing on the food safety training, pretending to eat off the floor, to shortchange their handwashing, and so on.