The term 'Batman Sound Effect' refers to the sound effects used in the Batman franchise, which are often used to emphasize a dramatic moment or action. The four crossword solutions for this term are WHAM (4 letters), POW (3 letters), BAM (3 letters), and OOF (3 letters). WHAM is a loud, sharp sound that is used to indicate a sudden impact or collision. POW is a sound effect that is used to indicate a punch or other physical attack. BAM is a sound effect that is used to indicate an explosion or other loud noise. OOF is a sound effect that is used to indicate a physical impact or collision.