totally dirty PISS - WG !

How gross is that and, above all, how dirty? My flatmate is having a nice bath but unfortunately I have to disturb her - I have to pee urgently! Unfortunately, the loo is broken. But what should I do? I've got a great idea - but my girlfriend doesn't seem too keen, laughs. But she doesn't know what's to come, because there are more people living in the flat share ;-)