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1 definition by Mr. Fundamentals

 
1.
Originated in the Midwest, it is a term to describe when a guy goes to finger a girl, but because he is totally trashed, he winds up getting her in the butthole. Some believe it stands for "Anal Jackhammer"
Dude, I heard you gave Heather the AJ!
Shut up man!
by Mr. Fundamentals September 27, 2005