wd-40 Share definition Flag 1. an oily lubricant to get rid of friction in between pieces of metal 2. nickname for someone suffering fromwhiskey dick Did you guys see WD-40 on Friday night, he needs to pop the blue pill wd-40 by C-Red February 17, 2004 0 0 Get merch Get the wd-40 mug. Buy Now — $32.95 See more merch