An internet meme involving puting something inside of something else, that is usually the same thing, in order to achieve carrying out a ceratain action while carrying out the same action. Most uses begin with the phrase "Yo Dawg"
A: Hey man, you want to hear an Exzibit Joke?
B: Sure, why not.
A: Ok, here goes. Yo dawg, we put a car in your car, so you can drive while you drive.