The Collaborative International Dictionary of English v.0.48:

Wallop \Wal"lop\, v. t.
   1. To beat soundly; to flog; to whip. [Prov. Eng., Scot., &
      Colloq. U. S.]
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   2. To wrap up temporarily. [Prov. Eng.]
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   3. To throw or tumble over. [Prov. Eng.]
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The Collaborative International Dictionary of English v.0.48:

Wallop \Wal"lop\, n.
   1. A thick piece of fat. --Halliwell.
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   2. A blow. [Prov. Eng., Scot., & Colloq. U. S.]
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The Collaborative International Dictionary of English v.0.48:

Wallop \Wal"lop\, v. i. [Cf. OFlem. walop a gallop; of uncertain
   origin. Cf. Gallop.]
   To move quickly, but with great effort; to gallop. [Prov.
   Eng. & Scot.]
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The Collaborative International Dictionary of English v.0.48:

Wallop \Wal"lop\, n.
   A quick, rolling movement; a gallop. [Prov. Eng. & Scot.]
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The Collaborative International Dictionary of English v.0.48:

Wallop \Wal"lop\, v. i. [imp. & p. p. Walloped; p. pr. & vb.
   n. Walloping.] [Probably fr. AS. weallan to spring up, to
   boil or bubble. [root]147. See Well, n. & v. i.]
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   1. To boil with a continued bubbling or heaving and rolling,
      with noise. [Prov. Eng.] --Brockett.
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   2. To move in a rolling, cumbersome manner; to waddle. [Prov.
      Eng.] --Halliwell.
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   3. To be slatternly. [Prov. Eng.] --Halliwell.
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WordNet (r) 3.0 (2006):

wallop
    n 1: a forceful consequence; a strong effect; "the book had an
         important impact on my thinking"; "the book packs a wallop"
         [syn: impact, wallop]
    2: a severe blow
    v 1: hit hard; "The teacher whacked the boy" [syn: whack,
         wham, whop, wallop]
    2: defeat soundly and utterly; "We'll wallop them!"