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To act sillier than silly. Actions that make you laugh or shake your head while giggling because the actions are just so silly, they are sillily.
My dog is so silly that she jumps into bed with her toys and rolls around sillily while holding it in her mouth.

Mr Jacob's 2 year old son runs around the house sillily laughing while running in circles.
by luvmydogz January 21, 2010
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