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its when a person being really mean to someone whos like really short or fat or tall or skinny.
dude: omg that guy is like soooo totally short
chick: omg your a size-ist!!
by apple face May 21, 2009
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A person that makes fun of or hates fat/large people. The extra fat upon a person's body discusses them.
Mother: Your friend David is so fat!
Son: Mom! You're such a sizeist.
by katz94 June 15, 2010
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A person against a specific size.
The school wanted large pencil cases but nothing small, they are sizeist.
by opheliadealia January 01, 2018
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