After looking on the BB Wiki, I think it was the "Strange Bedfellows" endurance comp at F4, but the wiki doesn't describe the comp or say if he peed. I do remember it being something about a bed.
Well, thanks for making me think about Cowboy peeing.
I want to him to get a penalty nom, because then they'll have to explain why on the broadcast show. Which means that they'll have to show footage of him sneaking food into the shower. Which will be really funny. And then they'll have to recap it in the following show with snarky announcer.
I'm going to try and manifest this.