Is the term "guinea pig" now or was it previously defined in the Pilot/Controller Glossary?
If it's not defined in the Pilot/Controller Glossary, maybe it's in some other publication.
I was flying with a crew member who used it while querying ATC about threading a hole in a line of weather. It went something like, "has anyone else guinea pigged that hole?" He said it was an actual controller term in their documentation.
I can't find it, but I was wondering if there was some kernel of truth to the statement.