This is used when you need a stronger word to ask someone to shut up.

In fact, the acronym has been changed by the years of usage and is now, a word by itself.

***The word "STFU" is said "STUFU".

So, "Stfu", spelled "Stufu" is said instead of "Shut Up".

But some exceptions occurs when it is employed as a single word instead of a sentence.

For example ; if you say "Stfu" only, it is a sentence meaning "Shut up", but if you say "Shut the stfu", "Stfu" becomes just a word, combined with "shut the", meaning anything stronger than "(shut the) fuck up" or "(shut) up", giving a stronger impact on the sentence.

A man who messes around with other men, but no one would ever know by looking or talking to him. Used by gay black men to identify masculine gay men or DL Brothas.