Whacking rhymes with:
attacking, backing, cracking, hacking, jacking, lacking, packing, racking, sacking, smacking, snacking, stacking, tacking, tracking, unpacking, wracking
Whacking sounds like:
wacksman's, wagging, waging, wagons, waking, washing, wassink, waxing, waxman's, weakening, weakens, weakness, weaknesses, weighing, wheezing, whizzing, wickens, wiggans, wiggins, wishing, wishnick, wisinski, wisneski, wisnewski, wisnieski, wisniewski, wissing, wissink, wojnowski, wozniak, woznick, woznicki, wysong, wyszynski