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I'm a cool geek.

Well I'm definately not a dude

Girls are either cool or geeks.

Girls can be guys if they are in a group (you guys - California talk for Y'all).

They can be guys (plural), but they cannot be dudes.

While there is a female guy (a girl), there is no female dude (dudette?).

You have not seen the Biker Chics!  I let them call themselves ANYTHING they want.

I don't find them as relaxed as real dudes.