To strike hard with a whip or to crack a bullwhip loudly.
Compound of 'bull' (strength) and 'whack' (to strike). This variant of 'bullwhip' as a verb emphasizes the violent action. American frontier and ranching terminology from the 19th century.
Bullwhackers were actual frontier jobs—men with incredible arm strength who could crack whips over long distances to direct cattle herds. Cracking a bullwhip is still physically impressive and basically unchanged since 1850.
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