How do you say What is that supposed to mean in french?

There are several ways to say "What is that supposed to mean?" in French, depending on the context and desired level of formality. Here are some options:

Formal:

* Qu'est-ce que cela veut dire ? (This is the most literal translation and works in most situations)

* Que voulez-vous dire par là ? (This is a bit more polite and implies a misunderstanding)

* Quelle est la signification de cela ? (This emphasizes the meaning rather than the speaker's intention)

Informal:

* C'est quoi, ça ? (This is very casual and can be used with friends)

* T'as voulu dire quoi par là ? (This is even more casual and is used with close friends)

* Tu veux dire quoi par ça ? (This is slightly less casual than the previous option)

To express frustration or annoyance:

* Qu'est-ce que tu racontes ? (This means "What are you talking about?" and implies that the speaker finds the statement nonsensical)

* Tu te moques de moi ? (This means "Are you making fun of me?" and implies the speaker is offended)

The best translation will depend on the specific situation and the relationship between the speakers.