A decision by a court to revoke the jail sentences handed to two women who injured a paramedic in a drunken assault has been slammed by ambulance workers.

Ambulance vehicles were pictured in Victoria plastered with protest graffiti after the decision was handed down.

The jail sentences originally given to Amanda Warren, 33, and Caris Underwood, 20 were reversed on appeal in the Victorian County Court on Tuesday.

The women were originally sentenced to jail sentences of six months and four months after pleading guilty to causing injury.

Ambulance workers have protested against a decision by a court to quash the jail sentences handed to two women who injured a paramedic

Ambulance Employees Australian Union secretary Steve McGhie expressed his frustration with the decision in an interview with 3AW Drive.

'I'm quite disgusted with the outcome,' he said.

Victorian laws introduced in 2014 demand a mandatory minimum jail term of six months for anyone who intentionally injures an emergency worker, unless there are special circumstances.

Victim Paul Judd was 'gutted' by the decision, according to Fairfax media, and he said: 'I just feel that justice hasn't been done.'

The jail sentence handed to Caris Underwood, 20 (pictured left) and Amanda Warren, 33, right, was revoked on appeal in the Victorian County Court on Tuesday

Fair Go paramedic posted photos of ambulance vehicles displaying the message in pink and white writing: 'It's not OK to assault paramedics'.

'Paramedic after Paramedic, Crew after Crew, branch after branch, we all stand in defiance to today's ruling,' the organisation posted on social media.

An #itsneverok hashtag went viral social media on Tuesday as ambulance officers and the community expressed their support for the paramedics.

The debate even turned political, with Victorian Liberal leader Matthew Guy labelling the decision 'a disgrace' in a Twitter post.

'A complete failure of the Victorian justice system,' he said.

Fair Go paramedic posted photos of ambulance vehicles displaying the message in pink writing: 'it's not OK to assault paramedics'.

The women admitted punching and kicking Mr Judd as he and another paramedic tried to treat a patient in Reservoir.

Lawyers for both women say the pair had tough childhoods but have started to turn their lives around since their drunken assault.

They both pleaded guilty last year to intentionally causing injury, while Warren has also admitted to criminally damaging the ambulance by ramming it with a car.

Ambulance Employees Australian Union secretary Steve McGhie said he was 'disgusted' with the outcome

Mr Judd broke his foot in the violent attack and has required multiple surgeries since.

The experienced ambulance worker has not been able to return to work since the violent attack in April 2016.

Fair Go paramedic was started by a former ambulance officer who worked with the service for 37 years.