Piss. Originating from the fact that actual German beer just tastes like someone pissed in some fizzy water, also the stereotype of piss in German sex/porn. Can also be used as another term for a golden shower.
I had some pretty kinky sex last night, she was really into Germanbeer.
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