charabier

An informal, fairly rare verb built directly from the noun charabia (gibberish, gobbledygook) — it means to talk in a confused, unintelligible way, whether from an unfamiliar accent, jargon, or garbled speech. Native speakers reach for the noun charabia ('c'est du charabia') far more often than for this verb form.

• Il charabiait tellement qu'on ne comprenait rien. — He was talking such gibberish that we understood nothing.
• Arrête de charabier, explique-toi clairement ! — Stop talking nonsense, explain yourself clearly!
• Ce contrat charabie à un point tel qu'aucun client ne le lit. — This contract is written in such gibberish that no client reads it.

This verb is rare enough that most French speakers instantly recognize the noun charabia but hesitate at the verb form — don't expect to hear charabier in everyday conversation; it's mostly literary or humorous.