Pokin till it's broken
When a guy has sex for so long that the only way to stop him is either the inability to get a hard on, or the literal snapping of his meat hammer.
Guy 1: "Damn, Jake's been in there with that girl for a looooong time."
Guy 2: "I know, 48 hours is ridiculous, he must be pokin till it's broken!"
Guy 2: "I know, 48 hours is ridiculous, he must be pokin till it's broken!"