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1.
A person that rides motocross (i.e dirt bikes and/or atvs) , who buys the most expensive gear, bike, and equipment but is terrible at the sport. They think they are good but have no style and look like they are a rag doll on the bike. When they accelerate it whips them back in a violent motion and they take out lines and berms on the track. They also land short on jumps also known as "casing". They have no sense of what they are doing.
"Hey Tanner, want to go to Throttle 215?" Said Chase.
"Yeah. Lets hope there are no goon-riders there." Said Tanner

"Hey Chase, isn't that your buddy Alex over there? He has the new 2012 Honda." Said Tanner
"Yeah, but he is a goon-rider." Said Chase.
"Oh man! You're right! ha What a goon." Said Tanner.
by TheAPON13machine November 17, 2011
 
2.
a street bike rider who obeys no traffic laws and could care less about running from the cops...and they have been known when ragged at a car to bend the antenna or kick the fucking side mirror off!
that kid justin is crazy he rides like its his death day what a fucking goon rider!
by jboswell November 30, 2007