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A fat person who tries to make it seam like they are ripped and so strong in front of other people. Often they attempt to down on others that are ripped like no ones business and have no body fat by saying "I'm bigger than you I could break your bones" but the truth of the matter is that the fat tool is coated in fat and attempting and failing to disguise it as muscle until they make the fatal mistake of taking off there shirt for the whole world to see that there "muscle" fails at life and is very limited and hiding under a thick layer of fat.
example of a fat tool:

kid: dude how much can you leg press and how many crunches can you do in a minute?

ripped kid: Yeah I can leg press 600lbs and 150 crunches in a minute on a ok day

fat tool: no you can't your too skinny you have no muscle

ripped kid: Dude your a fucking fat tool, thats all fat you loser you suck at life *shows fat tool and kid cut 6 pack* weres your 6 pack fat tool? Oh thats right you don't have one you fat tool all you have is a big fat keg!!!

fat tool: *Crying* I wish I was ripped like ripped kid! *Runs off Crying*
fat tool by rower200 May 24, 2009
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fat ffiti 

the act of which involving a fat person spraying reddi whip or any other kind of canned whipped cream on the side of a ginger bread house
i cant believe tommy just did fat ffiti on the neighbors gingerbread house

fat fuck 

Alternative name for the mayor of Toronto.
Rob Ford is a fat fuck.
fat fuck by Truthful187 December 5, 2013

Fat, black or bot 

The three types of women an average-looking man will match with on Tinder.
Average-looking guy: "Hey man, I just got a match on Tinder!"
Other average-looking guy: "Don't get too excited. Is she fat, black or bot?"
Fat, black or bot by Eyetym April 24, 2015
Another word for a vending machine
I'm starving! I'm going to go visit the fat box
Fat Box by AMN July 1, 2015

fat ball of floof 

A fat ball of floof is another name for an extremely cute yet fat cat.
Omg look at that look at that fat ball of floof, he is so cute!