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1.
a silly noise one makes when they wish you to be quiet: usually used in combination with a pointer finger before ones mouth
Kris: LA LA LA LA LA LA LA
Susie (with her finger in front of lips): Shhh....be quiet
by Jadah February 05, 2005
 
2.
1. An onomatopoeia used both in speech and online to tell another party to be quiet. When used online it translates to telling another party to stop messaging them.
"OMG YESS!! I'M SO HAPPY!!!"
"shhh... I'm trying to work."

CJ: <_<
Ariel: SHHHHHH
by dancemastercj November 17, 2008