verb (used with object)
to beat soundly; thrash.
Informal. to strike with a vigorous blow; belt; sock: After two strikes, he walloped the ball out of the park.
Informal. to defeat thoroughly, as in a game.
Chiefly Scot. to flutter, wobble, or flop about.
verb (used without object)
Informal. to move violently and clumsily: The puppy walloped down the walk.
(of a liquid) to boil violently.
Obsolete. to gallop.
a vigorous blow.
the ability to deliver vigorous blows, as in boxing: That fist of his packs a wallop.
the ability to effect a forceful impression; punch: That ad packs a wallop.
a pleasurable thrill; kick: The joke gave them all a wallop.
Informal. a violent, clumsy movement; lurch.
Obsolete. a gallop.

1300–50; Middle English walopen to gallop, wal(l)op gallop < Anglo-French waloper (v.), walop (noun), Old French galoper, galop; see gallop

walloper, noun
outwallop, verb (used with object)

3. trounce, rout, crush, best.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
wallop (ˈwɒləp)
vb , -lops, -loping, -loped
1.  informal (tr) to beat soundly; strike hard
2.  informal (tr) to defeat utterly
3.  dialect (intr) to move in a clumsy manner
4.  (intr) (of liquids) to boil violently
5.  informal a hard blow
6.  informal the ability to hit powerfully, as of a boxer
7.  informal a forceful impression
8.  (Brit) a slang word for beer
vb, —n
9.  an obsolete word for gallop
[C14: from Old Northern French waloper to gallop, from Old French galoper, of unknown origin]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

late 14c., "to gallop," possibly from O.N.Fr. *waloper (13c.), probably from Frankish *walalaupan "to run well" (cf. O.H.G. wela "well" and Old Low Franconian loupon "to run, leap"). The verb meaning "to thrash" (1820) and the noun meaning "heavy blow" (1823) may be separate developments, of imitative
Online Etymology Dictionary, © 2010 Douglas Harper
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Slang Dictionary

wallop definition

  1. n.
    a hard blow. : She planted a hard wallop on his right shoulder.
  2. tv.
    to strike someone or something hard. : The door swung open and walloped me in the back.
  3. n.
    influence; pull; clout. : I don't have enough wallop to make that kind of demand.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw-Hill Education.
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American Heritage
Idioms & Phrases


see pack a punch (wallop).

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
But in comparison with earlier economic crackups, this crisis has packed an
  emotional wallop but only an intellectual whimper.
But a good pint of wallop, with chums, in a decent pub.
In the world of monster fish, these whiskered whoppers may not be pretty, but
  they pack a wallop.
The innocuous-looking pellets are about the size of almonds, but in your mouth
  they pack an invisible, highly potent wallop.
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