grease spot

Noun

 * 1)  A minute remnant, humorously the only distinguishable remains of an antagonist after a fight.
 * 2) * Quoted in 2011, Thomas Christie, Hampton Smith, Brother of Mine: The Civil War Letters of Thomas and William Christie (page 242)
 * [W]hole Brigades of theirs were "wiped out," there being hardly a grease spot left of the Kentucky Brigade, which were the ones I saw fight.
 * [W]hole Brigades of theirs were "wiped out," there being hardly a grease spot left of the Kentucky Brigade, which were the ones I saw fight.