What does POWERSTROKE stand for?

Here's a list of possible definitions for the shorthand POWERSTROKE:

Definition	Category

Definition

Category

Pricey Old Workhorse Everyday Rust Smoke and Trannies Rupturing Often Killing us Everywhere	Funnies

Pricey Old Workhorse Everyday Rust Smoke and Trannies Rupturing Often Killing us Everywhere

Funnies