What is the game called where you have a guy in a rocket powered wheelchair?

The game you're referring to is likely "Rocket Powered Battle Cars," which features a character in a rocket-powered wheelchair. However, if you meant a different game, it could also refer to "Wheelchair Rocket League," which is a modification or fan-made version inspired by the popular game "Rocket League," where players control rocket-powered cars in a soccer-like environment. Both games incorporate the unique element of using rocket propulsion in unconventional vehicles.