Shut the f**k (offensive word) up, or STFU for short, is a phrase that means that the person, to which the phrase was addressed, should stop saying unnecessary dog-sh** and just close their mouth.
"The fitness gram-pacer test is a multi-stage..."
"SHUT THE F**K UP YOU SON OF A B**CH WHO CARES ANYWAY"
"SHUT THE F**K UP YOU SON OF A B**CH WHO CARES ANYWAY"
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