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1.
Someone who, upon becoming intoxicated, attempts (poorly) to sing along to every song that plays around them.
I'm trying to actually listen to this song, but all these Tequila Mockingbirds are too damn loud.
by Thomas Frick March 27, 2008
 
2.
A Mexican bird. Not to be confused with the novel To Kill A Mockingbird.
El Paso is full of Tequila Mockingbirds.
by gofishgo January 13, 2007