1. Somebody who is unsettlingly cheerful.
2. A sociopath or psychopath who acts charming and cheerful to lead anyone and everyone they meet into a false sense of security.
"Everyone says this girl is just very optimistic, but to me she's a buosin"
1. A person with little to no intelligence
2. Somebody with only one brain cell
"That guy is such an azat! He doesn't even know what 2 plus 2 is!"
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