Too Young Girlfriend

Alright, listen up, buddy. You're the kind of guy who probably thinks a microwave is magic. This joke is about a girlfriend, right? A girlfriend who's so young, she's like a baby. Like a really little kid who needs to be tricked into opening her mouth by making airplane noises. It's a silly comparison but it's supposed to highlight a big age difference. It's dark humor, and you probably think it's funny, but the rest of us are cringing.