This word means very ugly — not a little ugly, but strongly, almost shockingly ugly. People say it about clothes, a building, a photo, a car. They sometimes say it about a person’s face or body too, and that can really hurt, because it is a hard, unkind word, not a soft joke. It is not polite. You might hear it between friends, in comments online, or in films with rude talk. You would not write it in homework or say it to a teacher. Though actually, it is two words pushed into one: a swear word that here only means “very,” stuck onto ugly. Younger people use it more than older people. It is mainly an adjective (That shirt is fugly). A few people also use it as a noun for someone they think looks bad; that use is even ruder. It feels American, but English speakers in many places now know it.