A classic arcade game from the 1980's where the most common way of defeating enemies was to shoot them with an air-pump and inflate them bigger and bigger until they burst. Now used to describe the unfortunate state of someone who has physically 'let themselves go'.
Person #1: "Dude, did you see how fat she looks now?"
Person #2: "Damn, I know. She used to be so thin. Someone went 'Dig Dug' on her ass."
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