grayout

Occasionally, she said, “passengers may get some grayout,” a loss of color perception, which is the mildest form of g-induced stress.

“And we may, once in a blue moon, have someone who’s on the edge of having more than grayout”—ranging from tunnel vision to brief “g-loc,” or loss of consciousness.

“Sometime during the vertical loop after the first drop, I experienced a momentary grayout in which I saw spots,” reported a commenter on the online forum Theme Park Review about his trip to Kings Dominion in Doswell, Virginia.

Israeli correspondents called it a "fogout" or "grayout," but at times it seemed more like a blackout.

The same tone of grayout pervades every remark.