Ugh is an onomatopoeic word including the following meanings: A representation of an aspirated sigh or gasp, used as an interjection to express disgust, horror, repugnance, annoyance, boredom, or...
Babbling Brook.
Boom! Pow! Smack! Bzz!
Boiling of Sun Sweat of Sun Stickyness of Sun Gas of Sun Light of Sun
Yes it is an onomatopoeia