Definitionen
1.InterjectionA sound mimicking the loss of air, as if someone's solar plexus had just been struck.
2.InterjectionSynonym of ouch (“expressing sympathy at another's pain, shock at a high price, etc.”).
3.NounA sound made in pain, as when expelling air after being struck.
4.NounSomething cringeworthy, or which arouses disappointment; often used in conjunction with the qualifier big."That is a mega oof."
5.NounMoney. .mw-parser-output .defdate{font-size:smaller}