Top definition
i. who has fucking big eyes that looks like a fucking turtle

ii. someone who loves to have sex in the beach

iii. someone who always needs a condom
i. OMG shes just a yoonchan!

ii. EWWWWWWW everyone is yoonchans.

iii. omg you're a yoonchan, you dont need one!
by yoonchan March 06, 2008
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