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A phrase indicating indifference or lack of interest in something.
1) Person 1: "Hey, man, you been playing any basketball recently?"

Person 2: "Eh, not really. It's on the differential."

2) Jim: "Feeling like going to the pub tonight?"

John: "Meh, I dunno. It's on the differential."
by teriyakijockey April 07, 2013
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