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1.
A Sad Cow is a drink made with Tequila, Jägermeister, and Bailey's Irish Cream. It tastes of existential sadness and has an aftertaste reminiscent of huffing permanent marker.
It's your 21st birthday? Bartender, we'll have one Sad Cow please.
by Clayzerbeam June 20, 2013
 
2.
The Sad Cow is used to get a third party reference and viewpoint on a given situation when a third party is not around. Also used to make gauge the fail or win of a situation without risking being quoted on your thoughts of a situation.
"This has made Sad Cow happy..." - After two chicks making out
by Chad Barrett October 16, 2008