bun boy Share definition Flag Someone who is an ass kisser, usually at the workplace. This person sucks up to the boss at all costs, snitches people out and usually receives perks for doing so. I see the day turn bun boy is sitting around doing nothing as usual. bun boy by pukie March 31, 2007 0 0 Get merch Get the bun boy mug. Buy Now — $32.95 See more merch