usually sets in around your 4th or 5th drink of alcohol, it occurs when your face becomes expressionless and thus less attractive. Can be a particular downside when attempting to attract members of the opposite sex
Brandon:"Woah, John's not doing to well over there with the ladies. He looks totally plastered"

Nate: "You're right. Better get him some gum to chew quick to get rid of that bar face!"
by Natron B November 7, 2009
Get the bar face mug.