(an exclamation used to sympathize with someone else's pain or dismay, or to express one's own): Oof, that conversation must've been so awkward and hurtful!

Is oof in the Oxford English dictionary?

exclamation. Expressing alarm, annoyance, or relief. 'I know a place on earth we can go, if you guys can - oof! '

Is oof in the Webster dictionary?

Oof. The Merriam-Webster dictionary defines it as a word “used to express discomfort, surprise, or dismay”. The Oxford dictionary's Lexico.com concurs, defining it as an expression of “discomfort, as from sudden exertion or a blow to one's body”.