"You're killing me, __!" (6)

I believe the answer is:

smalls

(Other definitions for smalls that I've seen before include "Diminutive items of underwear" , "Underwear (colloq.)" , "Diminutive articles of underwear?" , "Diminutive undergarments?" , "Undersized underwear?" .)

I've seen this clue in the LA Times.

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