Tijuana Carpool

The act of making sweet love in the shower while a third party is evacuating their bowels within the confines of the same lavatory.

Kyle: "Brett, did you just take a shit in the first floor bathroom?"

Brett: "Yeah, what about it?"

Kyle: "What the fuck, man! Weren't John and Nikki having sex in the shower in there?"

Brett: "Yeah, man. I love a good Tijuana carpool!"