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1.
when, after a few drinks, one will proceed to become an unhappy drunk, and begin to cry and shed tears about anything remotely bothering them. ex: crying about ex-boyfriend, inability to microwave easymac, spilling a drink on one's shirt
"After I had three natty lights, I started regretting my last drunk hook-up and started crying. My friends had to comfort me because of my beer tears!"
by brunette22 February 16, 2006
 
2.
When a drop of the clear salty saline solution secreted by the lacrimal glands is produced by a sad song during a drinking binge.
You are drinking and the song "Last Kiss" by Pearl Jam comes on. This in turn creates a beer tear.
by AmandaDale September 09, 2006