Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
slam-bang is an adverb and adjective meaning "in a careless or reckless manner". It carries 4 recorded senses.
with heedless speed
“yachts ran slap-bang into the convoy at 15 knots an hour”
in a violent or sudden or noisy manner
“the pans fell slam-bang and woke the whole house”
violent and sudden and noisy
“a slam-bang collision”
slang
Definitions, synonyms and semantic relations for slam-bang come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.