A highly infectious STI (STD). It is a viral STI, so it cannot be cured with antibiotics. Anal sleds are transmitted through acts of anal sex, or sodomy.
This STI is not, in fact, proven to be in existence, and is not acknowledged by the Catholic Church, but is a phrase commonly used in southern california to identify those who engage in acts of butt-piracy.
Bob: hey, do you see those three over there eating lunch? I hear they all have anal sleds.
George: What?! Both guys and the girl? You mean, they all got anal sleds from each other?
Bob: Yeah. It's pretty nasty. I hear they have it in an advanced stage, too.
by anal sleds June 2, 2010
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