This word is a combination of the true form of classy, with the elegant version of sexy. Of course this typically refers to white trash, ghetto, or a brew of the two.

It is when you are simultaneously both classy and sexy.
"Don't hold back young stud, I might be a BBW...but I'm as clexy as they come."

by ruthless val February 17, 2008
The state of being simultaneously clever and sexy.
"That Sarah is one clexy girl!"
by Ling Tian January 27, 2008