Between yesterday and tomorrow; in other words, today.
We're having a party tonight, because my birthday is yestermorrow.
by OhcaptainMycaptain November 24, 2009

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Top Definition
When you can't remember what day something happened, because you've been awake for too many consecutive days.
Person 1: Remember that party yesterday... wait, or was that this morning?

Person 2: I don't even remember anymore, it was yestermorrow.
by TheReminder June 12, 2011

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When some idiot mixes yesterday and tomorrow together!
his birthday was Yestermorrow.
by KXLB3 August 21, 2006

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).

Buy the t-shirt