Knuckle reject Share definition Flag When you attemp a fist bump, but the other person denies it. "Hey bro, what's up?" (Attemp a fist bump) "No man, NO!" (Knuckle reject!) Knuckle reject by JERALDtc May 21, 2013 0 0 Get merch Get the Knuckle reject mug. Buy Now — $32.95 See more merch
