whap

Multiple Entries:
  whap    whop  

Concise Oxford English Dictionary © 2008 Oxford University Press:
whap
verb (whaps, whapping, whapped) & noun chiefly N. Amer. variant spelling of whop.

Concise Oxford English Dictionary © 2008 Oxford University Press:
whop /wɒp/ (chiefly N. Amer. also whap) informal
verb (whops, whopping, whopped) hit hard. noun a heavy blow or its sound.

■ the regular pulsing sound of a helicopter rotor.

– origin ME: var. of dial. wap ‘strike’, of unknown origin.
'whap' also found in these Oxford entries:

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