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A very silly person or a normally serious person who for some strange reason is acting out of character via goofy remarks , comments, or actions.
Hey you silly fuck, stop eating all those paint chips!

Peanutbutter & motor oil does not make for a good sandwich, you silly fuck!

Listen, you silly fuck...if you think that grandma's tits are sexy then you should see her ass!
by philbad August 02, 2005
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