I'd been playing this game for a while over on SA. Saw it posted here, didn't bother.
Until now.
I looked through the thread, and didn't see anyone beating this score (except the guy who cheated/faked the screenshot). Thought I'd post it because I'm more awesome than you.
The highest I ever got into the air was around 450m. If you have a lot of speed when you hit the green girl, you can get 200m or higher. Then just use the bike girl to keep you in the air, and you'll add roughly 1/3 to your height each time. You'll get even higher if you hit the right girls without touching the ground first. Not that height matters, but it's fun to be able to take a piss break without having to pause.