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A fat kid in a group and/or crowd that is fat, but calls others fat by telling them to shut up, but in his/her fat ways.
Johnny the fat kid was in a crowd at a Katy Perry concert, and a skinny kid was infront of him standing up and cheering and blocking his view, Johnny quickly yelled "SIT DOWN YOU AND FATTY-UPPER!"
by snagit || look it up (:: June 14, 2017
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