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A fat, gay guy who loves to ride on the backs of bigger guys, usually because they're either gay or too drunk to fight back.
I saw b-dude riding on my cousin's back like he was a horse at the park.
He climbed on my dad's back during the Super Bowl and refused to get off until the game was over.
He showed up at the gym and started riding the guy on the treadmill like it was a horse race.