1) To be funny in a cute way
2) To be funny in a neardy, weird way
1) When my baby sister dances around with a pail on her head, she looks so silly!
2) Those guys look way silly when they have all their role-playing capes and gear on.
by rachel September 11, 2004
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Derived from a small town in the US, the silly is most often used as a noun to describe or act as a substitute for anything the speaker desires, but usually refers to something sexual in nature.
"I can't find anything to write with. Go get me a silly."
"Put your clothes in the silly."
"They were doin' the silly last night!"
"Hey baby, wanna go do the silly? Eh eh?"
"What the silly??"
"What in the silly were you thinking?!"
by TehSillie May 12, 2004
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adjective
used by parents to replace the words fucking retarded.
mom says "Timmy stop being so silly!"
by rebel_john747 April 19, 2009
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the awesome friendship between Millie Bobby Brown and Sadie Sink.
Millie: Shady Sink!
Sadie: Millie-Mills

Me: They’re so cute! I ship their friendship so much! Sillie for life!
by helpmeimdead September 18, 2018
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A word you use for someone who is always making people laugh by what they say and always making jokes..usually happens with people by the the name of Joel.
by JejejejejejEJe April 9, 2012
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The most awesome complement you can give a person! It is cooler than cool or even ice cold. Silly is the epitome of greatness, and a term used only to describe the greatest human beings on the planet
David:I shall find me a shark man
Charlotte: Your silly
David: why thank you!
by FurbyArmy July 1, 2010
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When you are in class and you are supposed to be filling in the blanks for something like science, but instead you fill them in with the same word over and over again. e.g. Unicorn.

Silliness: the art of being silly
The Earth began 14 Unicorn years ago. The Unicorns then roamed the Unicorn for hundreds of years. Around Unicorn years ago the unicorns took over from the unicorns and the fish started to unicorn. Birds were next as they too unicorned, they went from unicorns to bigger unicorns to even bigger unicorns. The unicorns then ruined the Earth creating lots of unicorn which is damaging our solar unicorn.

Today, I used my extreme silliness to make biology more interesting.
by The Unicorn of Unicornacopia October 7, 2017
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