What rhymes with thwacking

attacking, backing, backtracking, barebacking, blacking, bushwhacking, clacking, cracking, hacking, hijacking, jacking, knapsacking, lacking, lumberjacking, packing, quacking, racking, shacking, sidetracking, slacking, smacking, snacking, stacking, tacking, thwacking, tracking, unpacking, whacking, wracking