Slapdash rhymes with:
balderdash, jordache, ayyash, backlash, backslash, balderdash, barbash, cybercash, eyelash, fiveash, jordache, mishmash, monash, moustache, mustache, overcash, postcrash, potash, whiplash
Slapdash sounds like:
sailboats, sculpts, selvidge, silvadio's, slivovitz, sulfites, sulphates