Kosei is a common Japanese name for a boy, and its meaning is navigation and life. He is probably the nicest person you will ever meet in your lifetime. He is usually very athletic and also strives in academics.
Kosei is a genius
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Something found in the inner rectum, with a disgusting smell that is surprisingly satisfying. The human manifestation of such a thing, would most definitely be a pervert. A pervert who likes to touch the Koseis of other men.
*sneaks up behind a guy taking a dump* "Hey man, can I feel your Kosei"
"Ew, get away from me perv!"
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Aussie slang for a guy who's a champion at having sex with other peoples mothers.
"Hey man that guys just fucked your mum, what a kosey"
"Hi dude, i was jetting upstream and i looked in the window and saw your mum getting kosey'd"
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