1)For something to not be what you thought it was.

2) A PERSONA
EX.1
Man: I thought that was all your real hair

Women: Yeah, thats right its fake!!

Man: Yeah, I see now "It is what it isnt"

EX.2

Women 1:Girl, he has a lot of money and has nothing but the best.

Women 2:Who him?He works at the thrift store and lives with his mother

Women 1:Oh, So i guess "it is what it isn't"
by Tasha/impriss B. June 16, 2010
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not this one. this one is. So is that. and all of these.

How do you like that? It's in there too.
Jimmybob: "Yeah, I wanted to add a word to the urban dictionary, so I searched up 'what word isnt in the urban dictionary', but some dinglehopper put that in there too."

Bobjimmy: bruh
by master_of_the_house October 7, 2020
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