What is the meaning of Uff?

phew (expression of disgust, tiredness or relief)

whew (used before, during or after a mentally or physically strenuous activity, or while thinking of it).

Alternative form of auf

on, upon (positioned at the top of) [with dative]

on, onto, up, to (moving to the top of) [with accusative]

open

open

to get wet, to be wet, to be soaked

to inflate, to be swollen, to be bloated, to be puffy

to be angry

on

an expression of boredom, impatience or annoyance

on

whew (expression of relief)

whew (expression from strenuous labour)

Source: wiktionary.org