Strong swamp arm
It was in Episode 2, Episode 2, Season 8, Family.
Peter: Swamp? Hey, see you in a few days.
Swamp: (looks tired) Hello Peter. I checked some of it on the internet.
Perry: Are you alright?
Swamp: Yes, I'm fine, I'm fine ... I'm fine ...
Peter: Do you lift weights?
Swamp: No, no ... (back to use)