A bodyhacking scientist who had a NSW Opal card chip surgically implanted in his hand has pleaded guilty to fare evasion because he couldn't produce the travel card when confronted by a Sydney train inspector.

Meow-Ludo Disco Gamma Meow-Meow, formerly known as Stuart McKellar, pleaded guilty in Newtown Local Court on Friday to attempting to travel without a ticket and not showing a ticket for inspection in August 2017, despite having tapped on using his implanted chip.

Mr Meow-Meow, 33, had cut down the Opal chip, had it encased in biocompatible plastic and then implanted it just under the skin on his left hand by a piercing expert in April 2017.