Get the mental image and you'll figure it out. The person is deliberately ignoring what's going on around them, but instead of an ostrich burying their head in the sand, the person is so dumb that they are burying their head up their own butt.
It means Kieran Thornton, the thorn up your backside. LOL :)
It is the reading in Fahrenheit on a thermometer stuck up your bum/backside/back passage
backside
up utr backside
some humans could do the same,by talking through their backside.
Definition - a cross between a backside and a fish.
in metamorphic rocks that are shoved up your backside!
Cracking The Head Up
Cowboys loved a colorful phrase! This was a humorous way to refer to your backside. The image is of you in church on Sunday, kneeling with your backside out.
first get you ollie down then wind up "backside" or the way your feet are pointing. then pop your foot and turn your sholders so that you spin
simpler version not much
Showing your bare backside to someone