By analogy with eskimo brothers (two guys who've fucked the same girl), askimo brothers are two people who've eaten the same ass.
I was a little grossed out to discover that Steve and I are askimo brothers, but now that the initial blow has softened, I think it's just cool that we're in the same club.
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