the big d Share definition Flag the big d is a short term of the big dick and can be used to imply that people want it 1- hey dude 2- shut up 1- just cuz i have the big D and you want it 2- so did your mom last night the big d by All this 4skin January 8, 2013 0 0 Get merch Get the the big d mug. Buy Now — $32.95 See more merch