Particles that occur during friction between two people, during sexual activities. They cannot be seen by the naked eye but are present and can be felt.
When a man and a women are enaging in sexual beahviour, the shag particles occur.
When the girl/guy someone has been getting close with sexually/intimately is put on a pedestal and looks better than they actually appear to that person
Guy 1: I dunno mate, Jessica has huge titties, a big ass and she's so hot!!
Guy 2: Ahh, that just sounds like you got Shag Vision, man. I wouldn't mind her but I wouldn't go out of my way