What rhymes with thwacking

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