sockdolager

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sock·dol·a·ger

or sock·dol·o·ger S0528700 (sŏk-dŏl′ə-jər)n. Slang 1. A conclusive blow or remark.2. Something outstanding.
[Origin unknown.]

sock•dol•a•ger

(sɒkˈdɒl ə dʒər)

n. Older Slang. 1. something unusually large, etc. 2. a decisive reply, argument, etc. 3. a heavy, finishing blow. [1820–30, Amer.; sock2 + -dolager, of uncertain orig.]