spare tire

a tire used or kept available as an emergency replacement on a vehicle.
Informal. excess fat around the waistline.

1920–25 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Slang Dictionary

spare tire definition

  1. n.
    a thickness in the waist; a roll of fat around one's waist. : The spare tire started when I was twenty-six.
  2. n.
    an unneeded person; an unproductive person. : Gary is a spare tire. Send him home.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw-Hill Education.
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American Heritage
Idioms & Phrases

spare tire

Fat around one's middle, as in He's determined to lose ten pounds and that spare tire he's acquired. This expression transfers the term for an extra tire carried in cars in case of a flat tire to excess fat around the waist. [Colloquial; mid-1900s]

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
Liposuction is the only way to actually reduce the number of fat cells in your
  spare tire.
The spare tire bolts into a recess offset to the right in the swing-gate, and
  doesn't dip below the bumper line.
It still had the original hose clamps and spare tire which have since been
  replaced along with the original shocks.
There's something vulnerable about an eighteen-wheeler-sized spare tire that
  everyone thinks they can handle.
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