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A Sennen is a brainy, joke-telling, silly mess who thinks having fun with friends and making your banta laugh is the most important thing in life.
My banta is a Sennen. He turned my math test into a stand-up comedy show.
Sennen came to my house and turned my dinner into a joke. I got pizza for breakfast.
My friend is a Sennen. He made my teacher cry with a fart joke.