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A huge butt that looks like it could knock someone out. It's basically a fat ass that's so big it deserves its own nickname. Mostly used when a woman’s backside is so big it could start a trend.
Your butt is so big, it's a faddow. I'm jealous.
I saw her in the mall and I said, 'That's a faddow.' She turned around and said, 'Thank you, sir.'
He asked me out, and I said, 'Only if you promise to call my butt a faddow.'