Def 1. A person who is so large that they could easily occupy two chairs due to the size of their butt.

Def 2. One who cannot comfortably (or struggles to) sit on a chair because of their size.

Note: Depending on the fatness of the person, this term can be adapted to 3 chair, 4 chair, or 5 chair. Anything after 5 chair the joke becomes stupid.
"Hey man, check out that Two Chair on your right."

"Wow, that's more like a 2.5 Chair."

"Yea, definitely your team."
by Unparallel February 20, 2012
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