Jerf Share definition Flag A word to describe someone who has a shitty, downcast, condescending attitude. Derived from a combination of that one annoying co-worker named Jeff and the word jerk. The boss is making me stay late today, and its my daughter's graduation. He is being such a "jerf". Jerf by hujsww May 8, 2014 0 0 Get merch Get the Jerf mug. Buy Now — $32.95 See more merch