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 wet

to be wet

to swell

to be swollen

to be angry [with x]

to swell, to be(come) swollen

to pout, to sulk

to become breathless

breast, nipple

on

an expression of boredom, impatience or annoyance

on

whew (expression of relief)

whew (expression from strenuous labour)

Source: wiktionary.org