Meaning first-class or grade-A. Often used before an offensive word to emphasize the magnitude of that offensive word. Words that could follow A1 include but are not limited to: cunt, bitch, and slut.
After Sally, the puck-slut, blew Todd and the whole hockey team, he slapped her with his hockey stick and said "Sally you're an A1 bitch!"
by Davíd November 28, 2016
Get the A1mug. by 6ass9 July 27, 2017
Get the A1mug. Tamzin Outhwaite
by Laurence Fowler November 23, 2002
Get the A1mug. by Dr. Seuss, PhD July 28, 2011
Get the A1mug. 
