He Dwaynes his Johnson.
Explanation: This joke uses a clever play on words involving Dwayne “The Rock” Johnson’s name. “Dwaynes” sounds like “drains,” and “Johnson” is often used as slang for male genitalia. The humor comes from combining both meanings to suggest how The Rock would pee, using his name as part of the punchline. It’s a humorous mix of wordplay and celebrity reference.