The French equivalent of "WTF" is "Putain!" This expression is considered vulgar and should be used with caution.
Here are some other informal French expressions that convey a similar sentiment:
- "Merde!" (Damn!)
- "Bordel!" (Crap!)
- "Sacré bleu!" (Good heavens!)
- "Zut alors!" (Darn it!)
It's important to note that the appropriate translation for "WTF" will depend on the context and tone of the original phrase.