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?!"