'Just Unfriend': Biz Markie Celebrates National Unfriend Day On 'Jimmy Kimmel Live' (VIDEO)

Thursday Nov. 17 marked Jimmy Kimmel's second annual National Unfriend Day, when he encourages people to clean out their Facebook profiles and cut ties with any "friends" they may have who they're never going to talk to again.

To celebrate the big day, he invited Biz Markie on stage to sing a very special version of "Just a Friend", but with the lyrics tweaked to, you guessed it, "Just Unfriend."

So if this tale of meeting, never talking again, and then subsequent stalking sounds all-too familiar, maybe it's time for you to do a little unfriend cleanse of your own. Jimmy Kimmel would be proud.