When eating a Cheesy Gordita Crunch from Taco Bell, you take a bite and some of the meat/cheese falls out of the other end
Matt: "Man, this cheesy gordita crunch sure is good!"
*takes a bite and some taco meat falls out the back*
Mike: Jailbreak!
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When someone is driving down a road (usually slow, but not always the case), and they are driving right down the middle of the dashed line, thus "eating the dots" and earning the name pacman-in' it. This is normally not a good thing, contrary to the greatness that is Pac-man the arcade game.
"God, the stupid old bitch in front of us is going 25 miles an hour and pacman-in' it."