Hayden Kiefer, 19, was released from custody on strict conditional bail after facing Wollongong Local Court on Tuesday over assault and intimidation charges.

Among the conditions governing his release were that he be of good behaviour, live outside the Illawarra and that he not enter the region unless attending court or legal appointments.

However, Kiefer broke those promises only hours later when he was caught running amok at Corrimal Railway Station.

Police documents tendered to the court say CCTV cameras captured Kiefer running across the railway tracks - an offence under NSW law - at 9.40pm, before he took to several billboards and posters around the precinct with a black permanent marker.

Kiefer was seen to scrawl the tags "Skope", "Skopa" and "Binx", each of which have previously been linked to his graffiti profile.

NSW Transport officials monitoring the cameras contacted police. However, before they arrived, Kiefer was seen to stick his tongue out in the direction of the camera, before putting his hand down his pants and performing a lewd act.

Officers arrived a short time later and arrested Kiefer, who proceeded to show them his handiwork, on a nearby power box where he'd written: "f--- all cops and dogs, I hate ya all, free bored".

The police statement said the word "bored" was a direct reference to the tag used by serial graffiti offender Ricky Munn, who was jailed for a year last month after being convicted of graffiti-related offences in Kiama and Sydney.

At the time of Munn's sentencing, the court heard he was a high-profile member of "53G", a graffiti group network responsible for thousands of dollars worth of damage to property.

Facing court yesterday, Kiefer pleaded guilty to six offences including obscene exposure, graffiti vandalism and damaging property.

He did not apply for bail.