Source : Webster's Revised Unabridged Dictionary (1913)

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.]
   1. To boil with a continued bubbling or heaving and rolling,
      with noise. [Prov. Eng.] --Brockett.

   2. To move in a rolling, cumbersome manner; to waddle. [Prov.
      Eng.] --Halliwell.

   3. To be slatternly. [Prov. Eng.] --Halliwell.

Source : WordNet®

walloping
     adj : (used informally) very large; "a thumping loss" [syn: {humongous},
            {banging}, {thumping}, {whopping}]
     n : a sound defeat [syn: {thrashing}, {debacle}, {drubbing}, {slaughter},
          {trouncing}, {whipping}]