immediately vs slap-bang

immediately

adv
  • In an immediate manner; instantly or without delay. 

conj
  • directly (as soon as), instantly, the moment that. Indicates that the independent clause describes something that occurs immediately after the dependent clause's referent does. 

slap-bang

adv
  • directly or immediately 

  • in a violent or sudden or noisy manner 

How often have the words immediately and slap-bang occurred in a corpus of books? (source: Google Ngram Viewer )