wallop

Concise Oxford English Dictionary © 2008 Oxford University Press:
wallop /ˈwɒləp/ informal

▶verb (wallops, walloping, walloped)

• 1 strike or hit very hard.

  ■ heavily defeat (an opponent).

• 2 (as adj. walloping) strikingly large.

▶noun

• 1 a heavy blow or punch.

  ■ chiefly N. Amer. a powerful effect.

• 2 Brit. alcoholic drink, especially beer.

– derivatives
walloping noun.

– origin ME (denoting a horse's gallop): from Old North. Fr. walop (n.), waloper (v.), perh. from a Gmc phr. meaning ‘run well’, from the bases of well1 and leap; cf. gallop.