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2.
The act of wearing articles of clothing which are all precisely the same color (i.e. gray on gray, orange on orange, etc.)

Related to Thootie Thursday
"Look at that thootie!"
by PHSXC January 30, 2012
 
1.
Derived from the term "thootie thursday" a thootie is an outfit worn once a week where both components of an outfit (i.e. sweatshirt and sweatpants) are matching in color. The basic thootie is gray on gray, however, "thootie" is a loose term which can be applied to a variety of different outfit combinations. For example, a dark blue shirt worn with dark blue jeans to school may still be considered a thootie even though it does not conform to the original thootie thursday of strictly sweatshirts and sweatpants as originated by the Princeton High School Winter Track Team.
Sarah: "Guess what tomorrow is?"

Emily: "Thursday???"

Sarah: "Wrong. It's thootie thursday!"

Emily: "Yess! I cannot wait to sport my pink sweatshirt and matching pink sweatpants!"
by luvbug121 January 17, 2012