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bad knee 

(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.
bad knee by strangerface March 23, 2010
Related Words

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.

Most often used by women.
Wow, look at all that stubble. I'm sure having a bad knee day today!
bad knee day by Hazzat April 23, 2010