An expression of approval.
Synonyms: alright, way to go
Origin: Although it may have earlier origins, the only place I heard it used was in Madison Heights, Michigan, by the now defunct Marauders Drum and Bugle Corps, ca. 1971. Probably invented by Jim, the drummer.
You just won a D & B competition:
"Fuck an A!"
Someone hands you a beer:
"Fuck an A, man!"
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