The abbr. of SHUT THE FUCK UP PLEASE. This is commonly used when used by a polite and very angry goody goody who cannot forget their manners, and involuntarily and accidentally adds please.
Ashley: lalalala
Jessica: STFU
Ashley: don't you mean STFUP?
Jessica: the hell is STFUP? STFUP?
Ashley: it means shut the fuck up please. jeez
Jessica: dork
by immaSYAUD June 27, 2009
shut the fuck up
oh my god dude stfup
by Francis Naud October 13, 2008

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