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The act of taking up extra space with excess body fat. Typically, a person who is in the act will demand that are entitled to the excess space, that it's everyone else's fault that do not fit. They will complain that you're an asshole if you don't accommodate them and allow them to spill into your space, making everyone around them extremely uncomfortable. This act is usually practiced by HAES and fat acceptance "activists" (please not that there is nothing active about these people).
Fat Person: Could you lift up your armrest, you're being rude.

Thin Person: No, I don't want you fatspreading into my space and squeezing the life out of me.
by Son of Stone June 09, 2016
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