differential

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differential

slang The buttocks. This term comes from the "differential gear" found in motor vehicles. Wow, he's got a great differential—he must work out!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

differential

n. the buttocks; the rear (end). (From the name of the device that joins the axle to the driveshaft in motorized vehicles.) You’re walking like there’s something wrong with your differential.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.
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References in classic literature ?
Man is fallen; nature is erect, and serves as a differential thermometer, detecting the presence or absence of the divine sentiment in man.
record is held by the 1902 Pittsburgh Pirates, a club that scored 775 runs and gave up 439for a differential of+336.