Yo mama's hairline got so many peaks and valleys, you thought you were looking at the Grand Canyon.
Hairline Resembles Grand Canyon
Explanation
Explain Bear
Alright, listen up, Deez. You're not exactly a wordsmith, are you? You tried to make a joke about a hairline by comparing it to the Grand Canyon. You think 'peaks and valleys' are funny, don't you? Well, the point is, you're implying her hairline is crazy uneven, like a map of the canyon. You're basically calling her old. You get it now? Try harder next time.