A person, straight or gay, that is addicted to anal sex or the ass in general.
Thomas: "Man RyanStarr sure is a bitch when Kate swings that ass in front of him."

Kale: "Yeah he is a fucking butt junkie"

Jason: "Yeah when it comes to both chicks and dudes."
by Stone Face Killa October 20, 2006
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one who likes another ones butt hole during sex
hey, i said doggy style.... you should have known i was a butt junky
by crasy james January 19, 2012
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