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1.
A person of the opposite sex who looks good at about 50 feet away, but looks like a steaming pile of crap at 20 feet. Frequently embarassing one in front of their friends.
(50 feet away) Bob: Dude check out that chick.
(20 feet away)Dave: Where, you mean that butterface?
Bob: uhhh, no no, that one behind her to the left.
Dave: Hey, that's my sister! You eyed a 50/20 didn't you?
by RockySTL December 08, 2005
 
2.
When a woman has the face of a 50 year old and the body of a 20 year old.
Dude, did you see that picture of Nicollett Sheridan in a bikini? What a 50/20
by Sams the Butcher October 16, 2008