Sound like a mix of Metal Gear and Super Smash Bros Melee? Well, that's what I thought, but further investigation proved this idea to be unfounded. James Tan aka 'Solid Snake' has come up with a gametype called Super Smash Melee that consists mostly of smashing the hell out of things using the hidden Bulldog vehicle from Unreal Tournament 2003.
You can pick this up in both .zip (710.9 KB) and UMod (733.9 KB) varieties. You'll find five more screenshots in the Super Smash Melee section of the site.Anyways, you get into a car and you smash stuff with it. The smashing stuff is players and everyone's lovable character Gorge!