Cum Share definition Flag The improper word for Semen or Sperm, a white liquid that shoots out of the male penis during an ejaculation. Dan: Yesterday I had some amazing sex, the girl took all of my cum! Jake: Wow... jealous. Cum by alee2006 June 26, 2018 0 0 Get merch Get the Cum mug. Buy Now — $32.95 See more merch