This phrase itself is a
combination of the terms Shoish and Moish. The
combination of the terms is primarily used as a reaction response, but the situation in which it's used usually doesn't matter. It can be a response to something surprising, shocking,
disappointing, etc.
The most popular use of this phrase is typically a go-to response or filler phrase to something that doesn't warrant a lengthy one, similar to the words "sheesh," "damn," or even "wow."
1. *Muaaz clutches on de_dust2* "SOMEBODY
GET THIS MAN A
CONTRACT, SHOISH MOISH!!"
2. Damn, bomb down (in CS:GO)!? Shoish Moish
3. "I just spent 3 hours practicing
the smokes.." Shoish to the mfn Moish