Used to express disappointment or annoyance. / Used to express excitement or enthusiasm.

(idiomatic) An expression of mild disappointment or resignation; too bad, it's a pity.

(informal, slang) Used to indicate agreement, often sarcastically. / (informal, slang) Used to introduce a refutation, sometimes sarcastically. / (informal, slang) An exclamation of excitement or joy

An expression of dismay, concern, worry or disapproval.

Used other than figuratively or idiomatically: see oh, really. / (colloquial) An exclamation of surprise or amazement. / (colloquial, sarcastic) Said in response to an obvious statement.

used as an expression of frustration, disgust, disbelief, or incredulity

Said in dismay, often sarcastically.

(Internet slang) oh no

(idiomatic, euphemistic, chiefly US and Canada) oh my God

Expression of surprise, dismay, or both.