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Your backside, your rear, your bottom, your butt, your cabackus. It’s like a family heirloom from a bunch of drunk Russians who never got a proper name.
My cabackus is so big, it has its own ZIP code.
I sat on a chair for three hours. My cabackus is now a fossil.
He called my cabackus a 'biscuit' in front of my mom. I still hate him.