A strong, muscular girl or woman; similar to "beefcake" in the sense of a muscular man. Could be used in reference to bodybuilding women (however, use caution).
"I suprised the guys when I showed up at the gym and picked up some free weights. They didn't realize I was a beefcupcake."
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