What is Ssshhh!?
1.
1) SHUT THE F*CK UP!
2) SEE EXPLANATION #1
3) Innocent way of saying "be quiet", usually by children who have done something naughty and wish to remain it being both confidential and secret.
4) The quickest way to abort a gossiping session.
I was just about to tell Jane about Dick's infidelity when Mom glared at me and said SSSHHH!
See