Top Definition
A rare mental illness that is characterized by an erroneous inflated belief in ones physical attractiveness which results in an inability to pass a mirror without stopping to stare wistfully at ones reflection. Other side effects may include, but are not limited to, excessive, irritating smiling and loud, obnoxious social laughter.
Did you see how Johnny keeps stopping in front of mirrors to comb his hair? I think he’s going a little swiftnuts.

What’s up with little Mikey smiling at every woman that walks by? If he wasn’t so swiftnuts he might actually be able to get a girlfriend!
by swiftnutty January 13, 2011

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