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1.
Historians have discovered that the first Seun was the great king Seun, King of a tribe of sand people known as the Mongoloids.
Known for there mis-proportioned bodies modern day Seuns are often referred to as Chodes. They are often involved in homo-erotic illegal activities. Despite these disadvantages Seuns are kind hearted simple folk who are known for being overly flamboyant.

They suffer from Seun-itus which is scientifically defined as a gigantically thick penis. Hung like a t-rex they are famous for there sexual exploits.
Seuns are the only people that Wesley Snipes fears.
guy 1: "Did you hear about the girl that got killed by having sex with a horse"
guy 2: "That was no horse, that was Seun."

Woman 1: " I had sex with this guy last night, my pussy is now the size of stargate."
Woman 2: "so he was hung like a seun."
by sanchezandjebus69 January 22, 2013
 
2.
Unclutch, as in when someone cannot come through in the clutch
"Man, that kicker missed that last second 15 yard field goal, he's so Seun." Person 1
"Yeah, thats very Seun" Person 2
by Clutchmaster P August 26, 2006