See STFU. It is a quicker and easier way of saying STFU without having to look like a fool with your spelling. It also lowers the chances of spelling errors while hammered.
An existential irrational magic, a playful fuss over nothing;
similar to foofaraw meaning "excessive or flashy ornamentation" or "a fuss over a trifling matter";
related to acting the fool to behave in a comical manner.
In a land overgrown that was known to be shown by its own magic tone of Foo Fah...
The Foo Fah festival was filled with fairly ridiculous flights of fancy.
Delonte: Yo Jamz, why you be all up in my grill dawg?
Jamal: Shut yo mouth muthafucka! I gotta can of whoop-ass waitin for you so yo u betta brace yoself foo'!