Hugh MacMaster has a penis so large, he has to use a custom made condom. when entering other countries he has to declare his penis as a weapon of mass destruction, currently enlisted in the army his penis is regarded as a nuclear bomb as when he spurts semen entire cities can be leveled by the sheer torrent of the semen.
When you masturbate to a porno within a porno.
For example, when you are watching a porno and suddenly realize that the porno that the characters in the porno are watching is hotter than the porno that they themselves are doing.
Creeper 1: Dude, did you watch Ass Adventure IV yet?
Creeper 2: Yeah, but I don't remember anything from it. I ended up doing some metamasturbation when the girlfriend put on that video in the living room to get herself in the mood.