v. Wasting time, screwing around, sitting on one's tuchis to avoid doing any work.
This is the frummie equivalent of the African American term "bojanglin"

"If you would have stopped crotzing around, we'd have been there an hour ago!"

"Heshy was supposed to help me clean out the cholent pot 3 hours ago, he had better not still be crotzing around behind the pizza store!!"