A way to get your siblings to leave you alone. It means that they arent really fat but you see them being that way. Or used as a really bad come-back when you absolutely have nothing else to say.
(Younger sister is bothering you)
Older sister: You are theoretically fat!
Younger sister: Haha thanks! (and leaves)

or
Person 1: Your ugly
Person 2: Your theoretically fat!
Person 1: Your mama's theoretically fat!
Person 2: No you didnt!
od uživatele pinkzebra1 18. Červen 2011

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