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1.
To make a face after drinking beer, often made by people who are unaccustomed to alcohol.
Kyle made a bitter beer face after taking a sip of Natty Light
by rainman March 09, 2006
 
2.
This is used to decribe a girl who is so ugly the first time you see her a pained and disturbed look will cross your face.

Also a girl who looks like the bitter beer face guy from the old keystone beer ads.
Man! Did you see that bitter beer face over by the pool tabe?
by jimmyjuicejam January 06, 2005