"You pushed [him] and put him in a headlock, attempting to squeeze his neck or choke him out."
The prison officer was assessed by on-site medical professionals but deemed not seriously injured.
Waikato's defence lawyer Laurie McMaster called for any additional jail time to be served concurrently, as he was nearing the end of a two year and eight month prison sentence for a previous aggravated robbery.
However, Judge Matenga felt a cumulative sentence was needed for a "stern deterrent" and to encourage security within the prison.
"There should be order within the prison system."
He also acknowledged though that no sentence should be "crushing" or "snuff out any hope" Waikato might have as a young man with a limited history of violent offending.
He sentenced Waikato to two months prison, which was to be served on top of his original sentence.