very similar to "shut the fuck up" but is said in more of a blurting out, just cant take it anymore, fit of rage fashion. It is more a use of sounds vs words.

Pronounced with subtlety, and under your breath as a single word..

sh-t-th-f-ck-up.. but quickly.

When some little bitchboy is acting like a little tiny pee pee poo poo baby and messing up the group plans.