Definition of "pugh"

"Pugh!" says Sophia. "There! no, no: what should he do there? He is gone before this time, to be sure. Besides, why—what—why should you go to see? besides, I want you for something else. Go, fetch me my hat and gloves. I shall walk with my aunt in the grove before dinner."

1749, Henry Fielding, The History of Tom Jones, a Foundling