Slapping rhymes with:
clapping, flapping, lapping, capping, clapping, flapping, lapping, mapping, napping, rapping, recapping, sapping, scrapping, snapping, strapping, tapping, trapping, unwrapping, wrapping, zapping
Slapping sounds like:
scalping, shelving, slavens, slavinski, sleepiness, sleeping, slip-ons, slipping, slivinski, sloping, sloppiness, slovenes, solvency, solving, sullivan's, sullivans, sylvanus