1: The abs that get you laid 2: Abs that are perfect for having sex
Example 1:
Hose: Dude after I got from boot camp I was totally ripped my girlfriend practically dragged me into the bed.
Gustavo: Really? What made her so horny?
Hose: My sex-pack abs
Example 2:
Bogs: Yo man I just had sex with my girlfriend for the first time with a six-pack. IT WAS AWESOME!
Matt: Duh man that's why they're called sex-pack abs
A guy who has really sexy looking six-pack abs. Abs are basically sexy anyway, so you just substitute the word "six" for "sex", and you get "sex-pack".
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi