Usually occurs, whether on purpose or by mistake, after a night of dos equis and jose cuervo. When engaged in anal sex, instead of cumming in, on or around your partner you suprise them by shooting a steady stream of urin into their anus. This may or may not be coupled with a full blown golden shower.
Last Cinco de Mayo I got so waisted I bought a hooker and ended up giving her the ensenada enema. She liked it so much and I had to pee so badly that it turned into an all-out golden shower.