avoir la gueule de bois

You use this phrase just like a physical condition. Use the verb avoir (to have) followed by the expression. You can say J'ai la gueule de bois to explain why you are wearing sunglasses indoors. It is very common in spoken French. You can also add adverbs like une sacrée to say you have a 'hell of a' hangover. Just remember that gueule is a bit rougher than bouche (mouth).

Use it with friends while grabbing a greasy brunch. It is perfect for texting someone to apologize for your behavior last night. You can use it with close colleagues if your office environment is relaxed. It fits perfectly in any conversation about parties, weddings, or wine tastings. If you look tired and someone asks if you're sick, this is your go-to explanation.

Avoid this phrase in highly formal settings. Do not tell your CEO you have la gueule de bois during a board meeting. Since gueule is technically a slang term for an animal's maw, it can sound a bit crude. Avoid using it with people you need to impress. In a doctor's office, you might prefer the more medical une veille de fête or simply saying you don't feel well.

This expression dates back to the 19th century. It originally focused on the intense thirst (the 'woody' dryness) rather than the headache. The French have a deep relationship with wine culture, so this phrase is a staple of the language. It reflects a certain honesty about the consequences of a good time. Interestingly, the French often 'cure' it with a strong espresso or a citron pressé.

If you want to sound even more casual, you can say avoir les cheveux qui poussent à l'intérieur. This means 'to have your hair growing on the inside.' It describes that weird, fuzzy feeling in your skull. Another common one is avoir la tête dans le cul, which is very vulgar. Stick to gueule de bois for most social situations. It is the perfect balance of descriptive and common.