White visers are used primarily is gay gang bangs. The trend started in Germany and quickly spread to the states where they are frequently worn In low quality homosexual porn. They use the white visers to represent the sporty yet cum colored sexual relations the males have with one another.
Billy: "hey look at those cool white visers"
Ted:"no man, they're about to get some gay shit on and suck each other off"
Billy: "what the fuck, fuck white visers"