uncle jeff’d Posted in U Best definition uncle jeffâd The act of secretly yet abundantly refilling someone’s cup, wine glass, or mug with alcohol. At Thanksgiving last year, my cousin uncle Jeffâd me last night and now, I have the worst hangover ever. How satisfied are you with the definition? Looking for uncle jeff’d meaning? Delighted that you discovered the greatest determine on our web site! Recently this definition was actually observed 3 times.