Top Definition
When your sweatshirt and sweatpants are the same color. It is the phrase 'suity-suit' said with a lisp. Originating in Iowa City, IA, the term is sweeping the nation.
Kelsie was cold and put on her grey sweatshirt, only to realize, 'Oh no, I'm wearing a thooty-thoot.'
by eastcoastie April 02, 2010

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