Top Definition
Phrase used to denote frustration with or to dismiss a concept or notion that either

A.) Makes no sense
B.) Is not widely known
C.) Does not exist
Person 1: I heard you were sick, what do you have? Chicken pox? Measles? Armenian Bird Flu?
Person 2: Wha-? That's not a thing

Person 1: This new body lotion I have works by activating the fourth and third chakras
Person 2: That's not even a thing
by BlackMan646 February 05, 2010
1 Word related to That's not a thing

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