big wood Share definition Flag Having or possesing a larger then average penis. Usally meaning your hung like a horse, or it tickles your knee, or you even have to tuck it in your sock. Damn that boy jimmy smith has a big wood. And god damnit i wanna blow it a couple of times! :o) big wood by Mr.AdAmS December 26, 2007 0 0 Get merch Get the big wood mug. Buy Now — $32.95 See more merch