noun. uncontrollable laughter when over tired. the unit will laugh at even the stupidest things and may respond with harsh words that don't even make sense. the unit may even result in throwing things
During the late hours of the eve, Peter cannot help but have the sleepy sillies and whip books at his wives.
by Humpcatter16 January 17, 2010
Get the Sleepy Silliesmug.