"Ugh" is an expression often used to convey feelings of disgust, annoyance, or frustration. It usually indicates that something is unpleasant, distasteful, or irritating. People often say "ugh" in response to something they find gross or when they feel overwhelmed by a situation.
The word "ugh" does not have a specific origin as it is considered an exclamation. It is an onomatopoeic expression that mimics the sound of a grunt or groan, reflecting a visceral reaction to something negative.