Top Definition
An acronym coined by humorist Dave Barry: I Swear I Am Not Making This Up. Commonly used when relating a story that sounds unbelievable. ONLY used when the story actually is true.
Did you hear that Skinny jeans may lead to 'twisted testicles'? ISIANMTU!
by DeskDiva July 16, 2012

The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Your favorite word on a white mug.

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The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

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The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

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The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

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