A middle-aged Hells Angel who bashed a teenage German tourist with a baseball bat for claiming to be a member of the motorcycle gang has had his appeal dismissed by the High Court.

The teenager had made the claim in order to get into a nightclub.

The High Court dismissed Glyn Dickman's successful appeal against his 2014 conviction for intentionally causing serious injury and making a threat to kill.

The South Australian, who hit the teen "like an animal", had been sentenced to eight years' jail, with a non-parole period of five years and six months, in the County Court for the September 2009 attack.

Dickman, aged in his mid 50s, had his conviction overturned in the Victorian Court of Appeal claiming there had been a substantial miscarriage of justice due to evidence being excluded in the trial.