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A pointless way of writing "fuck" on social media sites, such as Facebook, Instagram or Twitter. It's a purposeful misspelling of the swear word, which makes people feel less guilty about cursing publicly.
Emily: "I'm really worried about Amanda Bynes."

Kelly: "Amanda Bynes don't give a cfuk about you-dat bitch just stupid."

Emily: "But Lance Bass says he's concerned that she's really mentally unstable. If Lance is concerned, you KNOW it's serious!"

Kelly: "What the cfuk...?"
by SandySquirrel July 11, 2013
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