Yo Dawg

Xzibit grins at you and delivers the sentence: "Yo dawg, I heard you like X, so I put an X in your X so you can X while you X." That's the whole thing. The joke is recursion — you take something and stuff a copy of it inside itself. "Yo dawg, I heard you like cars, so we put a car in your car so you can drive while you drive." The Pimp My Ride connection is the point: the show was famous for installing absurd things like a TV inside a TV inside a guy's trunk.

For a stretch in the late 2000s this was inescapable. It was one of the first true caption-format memes, the kind you fill in yourself, and it lived everywhere that old forums and early Reddit hung out. Programmers loved it for jokes about putting a function in your function. It got used so much that "yo dawg" became shorthand for the recursion gag even without the picture.

It is dead. Stuffing-a-thing-in-a-thing is timeless, but this specific image is a fossil from a very particular internet — Xzibit even said he was sick of it years ago. You'll still catch it occasionally from someone who was there, deployed with full nostalgic awareness that the kids won't get it. It walked so every "X but it's also X" joke could run.