Yo mama so strict that when Ponyboy told her that Darry hit him, she called the cops on Darry.
Strict Mama
Explanation
Explain Bear
Listen up, buttercup. This joke is all about how strict yo mama is. She's so strict that when Ponyboy from "The Outsiders" (a book, genius) said Darry (another character, keep up) hit him, she didn't just scold Darry. She called the cops! Because that's what you do when you're stricter than a librarian at a rave.