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Definition of Slap-bang
1. Adverb. Directly or immediately. "It hit slap-bang in the middle" 
2. Adverb. In a violent or sudden or noisy manner. "The pans fell slam-bang and woke the whole house" 
Exact synonyms: Slam-bang
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1. Adverb. Directly or immediately. "It hit slap-bang in the middle" 
2. Adverb. In a violent or sudden or noisy manner. "The pans fell slam-bang and woke the whole house"