Another Story... Cars

The first episode of Another Story...

Story
Carman: I am gonna build the Piston Cup for the Big Race this weekend!

Other Car: Okay.

Carman: I call it... pistoning it!

(few hours later)

Carman: I finished building it!

Other Car: Ooh, it's shiny.

Carman: Yep! And I pistoned it!

Other Car: WHAT?!?!

Carman: I pistoned it. It's simple. All you do is-

Other Car: OH SHUT UP I KNOW HOW TO P***! JUST GET AWAY FROM ME! (drives away)

Carman: ....what did I do?