A person, who acts in a special way and is not afraid to do so. Usually a small, cute, person who is very happy and can make you laugh whenever they want to. Also some one who is very fun to be around and acts in the silliest way possible.
sillysillygurll pranked me the other day, sillysillygurll is obsessed with nicki minaj. “do you like sillysillygurll?” “of course i like sillysillygurll, who doesn’t??”