The act of accidentally hitting a the wrong button, or spelling the wrong word, particularly on a smart phone.
"I meant to hit the correct answer in Trivia Crack, but I had a fat finger fuck up."
by CossBoss January 28, 2015
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A fat fuck it up is a fat person that fucks up any & everything they touch & eat.
Kiemora: “Jahshawn is really a fat fuck it up
Trinity: “I know girl he big asf”
by Nirt August 18, 2019
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