fuckins Share definition Flag Any stain associated with a sexual activity typically constituting a mix of semen and vaginal juices. "Hey Rob, whats that on the front of your shirt?" "Oh, that would be my fuckins from last night." fuckins by Rob "Tipsy" Z. December 16, 2008 0 0 Get merch Get the fuckins mug. Buy Now — $32.95 See more merch