"Obviously it wasn't the best night for you," magistrate James Lawton told Daniel Thomas Barratt when the 21-year-old appeared in the ACT Magistrates Court for sentence on Tuesday.

Court documents show the relevant incident happened in early August, less than a week before COVID-19 was detected in the ACT again and the territory went into lockdown.

Barratt and two women were ejected from Mooseheads because of "an ongoing disturbance" on the top floor of the Civic nightclub.

They then lingered outside and yelled at a security guard, who repeatedly told them to leave the area.

When the bouncer turned his back, Barratt performed what is colloquially known as a "mooning".

"The defendant pulled his pants down and pointed his posterior at [the security guard] before pulling his pants back up and spitting at the back of [the bouncer]'s head," police said in court documents.

When the security guard turned back towards him, Barratt spat in the man's face and ran off along London Circuit.

The bouncer gave chase and managed to restrain the 21-year-old, with the help of other security staff, but not before Barratt had tackled him to the ground.

Police came upon the scene during this struggle, and Barratt kicked out at officers while they were handcuffing him.

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Officers noted that he smelt of alcohol, had bloodshot eyes and was slurring his words.

Barratt ultimately pleaded guilty to charges of common assault and remaining in the vicinity of a licensed premises after being turned out.

His address is listed in court documents as being in Jindabyne, but when he appeared over the phone on Tuesday he said he was quarantining in Tasmania.

Barratt, representing himself, said he would soon be starting work at a mountain bike store on the island state.

Mr Lawton fined the 21-year-old $500 for spitting at the bouncer, and $100 for refusing to leave the vicinity of Mooseheads.

Barratt was given 12 months to pay.

"The simple message is don't drink too much and you won't be back before the court," the magistrate told the young man.

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