I can't remember who posted this, when they called the other forum a rag. I did some digging and found this. SH is just this a Yiddish word for rag....
Urban Dictionary is a slang dictionary with your definitions. Define your world ... shmata. 7 thumbs up. A yiddish term for a rag, towel, or washclothes. ...
www.urbandictionary.com/define.php?term=shmata - 15k - Cached gumby1116