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3.
When you don't have enuff time to utter the word "up."
Bill: Dude, that bear is gonna eat you.

Dude: Shut the fuck.....
by shiiiiiukno March 01, 2010
 
1.
"shut the fuck" comes from being to lazy to complete the phrase "shut the fuck up"
man shut the fuck
by Zack G. May 17, 2004
 
2.
an overly excited way to say:shut up, get out, no way.
Elizabeth exclaimed "shut the fuck!" after reaciving her acceptance envelope to college.
by elcii:) November 10, 2010