A hairdresser assaulted a couple in their 30s for kissing outside a nightclub because she doesn't like watching 'old people' make out.

Carly Edwards, 25, lashed out at the two lovers when they became affectionate at the front entrance of Edge Geelong, south-west of Melbourne, on October 24 last year.

An agitated Edwards approached the amorous pair, who were touching and kissing, and told them to leave the venue, the Geelong Advertiser reported.

She then punched the man and attempted to knee him in the groin.

Carly Edwards, 25, lashed out at a couple in their 30s for kissing outside a nightclub

During the outburst, Edwards said the victim was a 'disgusting old man' and called him a 'pig'.

She took aim at the drink in his hand by hitting it away, and he suffered cuts to his mouth from the glass splinters.

'Come on, hit me you coward. I know you want to,' she told the victim.

The ordeal continued about half-an-hour later when Edwards followed the pair from the precinct and punched the woman in the face, police prosecutor Senior Constable Kylie Jane said.

Edwards was arrested a few weeks after the blow-up, the court was told.

She told police she 'did not want to see old people making out' and was drunk during the incident.

The ordeal began when Edwards approached the affectionate couple and told them to leave

In an Instagram story on Saturday, Edwards shared a quote which seemingly touched on the ordeal.

'The beautiful thing about life is that you can always change, grow and get better,' it read.

'You aren't defined by your past. You aren't by your mistakes.'

Edwards pleaded guilty to two charges of unlawful assault at the Geelong Magistrates' Court on Thursday.

Defence lawyer Stephanie Mawby said Edwards reacted after seeing what she labelled a 'public sex act'.

In an Instagram story on Saturday, Edwards shared a quote which seemingly touched on the ordeal. 'The beautiful thing about life is that you can always change, grow and get better,' it read. 'You aren't defined by your past. You aren't by your mistakes.'

She added her client is 'very remorseful' for her actions.

Ms Mawby told the court Edwards had been diagnosed with bipolar disorder and a combination of alcohol and prescription medications on the night of the assault contributed to her conduct.

A serious sentence was pushed by Sen-Constable Jane who described the 'unprovoked attack' as 'extremely inappropriate' and 'disgraceful'.

Magistrate Peter Mellas said the behaviour was out-of-character but did not dismiss the serious nature of the assault.

The incident occurred at the front entrance of Edge Geelong, south-west of Melbourne, on October 24 2018

'The behaviour you engaged in was, obviously, completely and utterly inappropriate,' Mr Mellas said.

'But there's nothing in your previous history to indicate you are someone who does this on a regular basis.'

She was handed a 12-month good behaviour bond and is required to pay $1000 in court costs.