The red marks that show up on your knees when a lot of time has been reading, texting, or using a smartphone on the toilet.
Steve: "Did you have a good shit?"
Jamie: "Dang right I did."
Steve: "Yeah I can see your shitter's knee with those shorts on."
Jamie: "Dang right I did."
Steve: "Yeah I can see your shitter's knee with those shorts on."
by Magikchef01 October 15, 2013
Prolonged leaning forward on the elbows whilst engaging in iPhone gaming during the act of having a particularly tricky bowel movement. With the result of leaving a prominent red mark on the thigh saluting your efforts.
After a heavy drinking session on the Guinness, I was birthing a beast from my ass whilst trying to beat that tricky level on Angry Birds and it left me with serious Shitters Knee.
by DeNinjabreadman December 26, 2011