Bar beautiful 

a woman who looks amazing to you after you've consumed heavy amounts of alcohol.

that woman he woke up with sure looked bar beautiful last night.

Bar beautiful by Mondo91 May 19, 2008

Bar beautiful 

Refers to a girl who is physically quite average, but when she goes clubbing--with her make-up, hair-do, cleavage and tight jeans--and is viewed under the dim flattering lights, looks really good.

"Dude, you don't want to do that; she's just bar beautiful."

Also just BB, as in "I'm in the mood for some BBing tonight.

Bar beautiful by Scott Green Bay May 18, 2008