Gashead

From Gasopedia - Bristol Rovers Wiki

Gasheads is the name given to Bristol Rovers fans. It was originally coined as a derogatory term by Bristol City fans, but was adopted with enthusiasm by the Rovers faithful and now forms part of the distinctive image of the club, along with the blue-and-white quartered shirts.

The name stems from the fact that Rovers' old ground, Eastville Stadium, was next to a gasworks and the smell of the gas often wafted across the pitch during matches. This led to the team becoming known as The Gas and the fans as Gasheads.