It is when you have overgrown pubic hair and then you or have someone ejaculate on it. You then have to wait for it to dry out so it looks like sugar. Boom you now have a SugarBush
"Oh my gawddd the other night my boyfriendmade me a SugarBush! Ohh my it was so hawtt"
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.
FRIEND A: "Did you just take a stealthie of me?"
FRIEND B (turning phone around): "no I was just using snapchat's new filter, see?"