- An exclamation expressive of extreme contempt or distempt.
- A joking acceptance of loss in some form of competition, or humourous agreement.
#: "My website is much better than yours!" — "Let me check... bah!!"
- An exclamation of disgust: yuck
- An exclamation to fill space, often used as an intensifier; well, err, um.
#:Tu veux jouer aussi ? - Bah, ouais
#:'Do you want to play too? - Well, yeah''