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1.
Someone who attends AA for the soul purpose of getting laid.

Someone who has a lot of time in AA who sexually prays on newcomers.
That hot newcomer chick is gonna get trolled by that pervy 13 stepper.

That cougar is a 13 stepper, praying on freshly sober young dudes.
by wikkdkitty September 02, 2007
 
2.
n. a reformed 12 stepper; the thirteenth step is forgetting the previous twelve steps
Jose Contreras: Hey! I thought you said Brian stopped drinking, he's chugging that bottle of whiskey!
Bruce Lee: I guess he's a 13 stepper now...
by benny b from the bronx May 10, 2006