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1.
The definition of bragging about having a big dick but really having a small one.

Another meaning for Clayten is one who thinks everyone else is stupid but they are really the stupid one.
Girl: Wow I bet he has a huge cock!
Guy: Nah hes just a Clayten
Girl: Oh

Kid: Hahaha you only got one mark higher then me on the test stupid!
Other kid: Shut up, your just a Clayten

by Numbnuts Baker March 31, 2009