Top Definition
a rude and quick way to tell someone to "shut the fuck up"

pronounced - fah kee yup
friends father: umm.. can you turn the music down?? im having a hard time concentrating on something that really doesnt fucking matter at all.

you: FACKYAP!!

friends father: excuse me??

you: nothing. we'll try to keep it down.
by slitfromeartoear March 07, 2006

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