Top Definition
Spontaneous Erection Syndrome, sometimes called SES, is a disease that most men suffer from. It is a disease where a man will spontaneously get an erection, while not aroused.

SES usually occurs in a situation where the sufferer could either become embarrassed, or possibly look homosexual.
Tim: Dude! how'd you get a boner? We're watching Mythbusters for christs' sake!

John: I dont know dude, must be my Spontaneous Erection Syndrome.
de Marcus129 24 février 2010

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