Originated from the words, Ginger and Snatch a "Ginger Snatch" is just a combination of these two. Ginger Snatch is a person with a red haired pubic area. Ginger Snatch people are inferior to day walkers, yet superior to fire crotches.
"Did you see that ginger walking down the hall today?"
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.