piss gag
A piss gag is a device used in some BD/SM/Water Sports circles. I has a mouth hole in it to accommodate a guy's dick so when he sticks his cock through it and pisses, you, with his cock in your mouth, have to swallow it all.
Matt and some of us other cadets went to a gay bath-house, and some of them wanted me to wear a piss gag. I did -- and then they took turns sticking their dicks in my mouth and pissing -- I had to swallow it all -- I was pissing out their piss all night!