Pop Off Valve [POP awf vālv] - noun 1. A spring-loaded relief mechanism on a turbocharged engine that releases excess pressure within the engine manifold; 2. An IndyCar blog intended to release excess opinion within the fan community.
Acronym: P.O.V.
(see also: Point of View)
"Running my mouth, that's my pop-off valve. It gives me a little bit of relief so I could get back to what I was doing."
- Dale Earnhardt, Jr.