look up any word, like ethered:
 
1.
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!"
by Lude February 11, 2005