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The gayest thing that you can call someone. Used in anger to belittle a person.
"I'm street"
"No, silly buns, you're about as street as the term 'silly buns.'"
by Chris the Cracka February 27, 2005
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One of the characters from Metal Gear Toast 1,2, and 3. These flash movies are found at

Sillybuns also mean a extremely gay person!
"Sillybuns!" scream bob to his gay roomate.
by Conker5698 May 25, 2007
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