Supporter of Bristol's No 1 football team, Bristol Rovers, contrary to the opinions expressed under this name elsewhere in the Urban dictionary. Those were written by some cider guzzling, manglewurzle chomping inbreed who supports "Uhh, City, Uuh", the home for social inadequates disguising themselves as football supporters.
Gasheads are so-called because there spiritual home Eastville, now a shopping centre, used to stand in front of two large gas tanks. It began as a derogatory term from their neighbours City but was adopted by the fans as they spent a nomadic existence playing first in Bath and later at the Memorial Ground, Bristol.
Common saying among them "Up the Gas", "Oiright Gashead?"
Nearly 40,000 Gasheads travelled to Wembley to see their side beat Shrewsbury 3-1 in the League Two play-off final at Wembley in 2006/07