Definition of "ugh"

[...] It may have been a water-rat I speared, / But, ugh! it sounded like a baby's shriek.

1855, Robert Browning, Childe Roland to the Dark Tower Came, section XXI

"Ugh, what a smell of Christian blood there is here," screamed the giant.

1886, Peter Christen Asbjørnsen, translated by H.L. Brækstad, Folk and Fairy Tales, page 57

Ugh, you can't take that bitch nowhere

2023, “Paint The Town Red”, in Scarlet, performed by Doja Cat

The brothers surveyed the wide prospect earnestly. "Ugh!" said one abruptly and pointed. "Ugh!" cried his brother. The eyes of the whole tribe swung round to the pointing finger. The group became one rigid stare.

1921, H.G. Wells, “The Grisly Folk”, in Selected Short Stories, published 1958, page 291