Brnstig : (pronounced as if it were spelled "brunshtig") backside, the buttocks, the bumcheeks, the chuddies, arseetc. Generally considered one of the more offensive definitions for the buttocks, given its extreme lack of vowels.
Origin : Eastern European street name, re-defined by touring musicians.
1. "Kiss my Brnstig"
2. "That girl's Brnstig is so large that it's pratically overflowing from her underpants"
3. "Get ready for me to thrunge your Brnstig with a lamp-post, in preparation for a good old Croach."
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.