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An emoticon cute girls use like "owo" but with its eyes closed. It can interpreted as either be a sad or relaxed owo.
Sam: Hey friendo how are ya doing? OwO
Allie: My girlfrien dump meh UnU
via giphy
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2
An unpenetrated anus.
Guy 1: "hey i heard you have a unus."

Guy 2: "yeah, why--"

Guy 1: "not anymore."

Guy 2: "That was nice."
by Johnathan Senpaii July 12, 2014
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