Seat kicking.

I’ve seen it before where the enemy is on your warthog and the driver kicks out the enemy of warthog. How do you do that… I can only switch seats.

I have never seen this. The only way I know you can kick someone out of the warthog is by being the passenger and meleeing the driver.

When you are the driver, step out of the warthog.
1- If he takes the wheel, hijack it.
2- If he steps out from the passenger seat, ride again, step on the pedal, and drive through the horizon… driving through the horizon imagination with a warthog