The Grab:
Rear hand grabs toe edge in between the bindings.

The Tweak:
Poke it out by boning the front leg.

Performed By: Mike Rav

The History:
The term Indy, named after the Independent Truck Company* by skateboarder Duane Peters (who popularized this grab around 1980) was in specific reference to grabbing with your back hand, between your feet while rotating backside. For a more complete breakdown of the history and misuse of the term Indy, read this.