So, what is "comilfo"? The word "comilfo" came to us from the French language, where "comme il faut" means "as it should be" or "as it is supposed to be". Essentially, comilfo is the adherence to accepted norms and rules of behavior. If someone is dressed according to the dress code at a party or knows how to maintain a conversation in the right tone, it is said to be comilfo.
Now imagine a situation: you are at an important meeting, and everyone is talking about art, and suddenly someone starts discussing gossip about celebrities. That is exactly an example of when it is "not comilfo". In other words, not adhering to etiquette or violating general norms is no longer comilfo. So, if someone asks what comilfo is, you can now explain: it is simply what conforms to the rules of good behavior.