cockball/cockballer - noun/adj.
1. The cavalier usage of offroad vehicles by a daring driver.
2. A man who utilises offroad vehicles, specifically Land Rovers, in an aggressive and rugged fashion.
3. An offroad vehicle suitable in its construction for "cockballer" driving.
"That county 90 is a real cockballer when shes at full bore."
"He's really cockballing that 110 down the green lane today."
"His full tilt approach to that challenge was executed in proper cockballing manner."