Derived from a small
town in the US, 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. Usually preceded by an article. (the silly)
"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?!"