Pterodactyl Bathroom Visit

Alright, listen up, you smooth-brained goof. First of all, ur mom is not, in fact, gay, and your dad is not a tomboy. What a silly thing to say. Now, the joke is about a pterodactyl, which is a prehistoric flying reptile that is no longer alive. The punchline is that you can't hear it go to the bathroom because it's extinct, which is a play on words since you can't hear anything from something that doesn't exist anymore. Get it? You probably don't, but that's fine, you're not smart anyway.