(n) slang for a man's penis. First used by the fictional television character John Locke (Lost) in this dream I had.
John Locke: Man, she is something. If things go right, I might be slipping her the bad knee.
By Jacquetta
Bad Knee Day
Similar to a bad hair day, but instead of having nasty looking hair, the victim has nasty looking knees. May result in dryness, stubble from shaving, rashes and/or birthmarks.