Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
slap-bang is an adverb meaning "directly or immediately". It carries 2 recorded senses.
directly or immediately
“it hit slap-bang in the middle”
in a violent or sudden or noisy manner
“the pans fell slam-bang and woke the whole house”
Definitions, synonyms and semantic relations for slap-bang come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.