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when you are getting your dick sucked and your about to bust a load, you slap the bitch in her face. She will look to the side and looks right back at you saying what the fuck. You than bust a load in her face and say i FSU or Fuck Shit Up.
when i asked derek how the party went last night with lisa he just answered i Fucked Shit Up FSU. I understood what he meant and walked away laughing.
FSU by Pat Maygroyne May 9, 2009
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fuck shit up
fuck stuff up

you can come up with a million things. bit the main one is fuck shit up.

used when you don't really want to cuss because adults ate around or someone who doesn't wish to cuss
our teams stuff got messed up so fsu'd the other teams stuff
FSU by butterflier95 March 20, 2010
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Remember the movie Step Brothers? Possibly the funniest movie ever created. In the movie they said "lets fuck shit up." FSU is an easier acromyn for the term "fuck shit up." Use this term to say your about to party, or just do anything awesome or fun.
We're about to FSU tonight.

Let's FSU at this party.
FSU by ttimenikka June 17, 2010
dad: Lets go FSU at this party Raymond !
FSU by ffuckray June 22, 2016
"Let's go out this Saturday night and fsu!"
fsu by Wussy Arnold June 7, 2016
FSU is texting shortcut for Fuck Shit Up. Fuck Shit Up is usually used when a group of people do something and mess it up, but in a bad way.
Lads, school is starting and we need to start to FSU.
FSU by Genius of Terms and Words January 8, 2017