Top Definition
Undeserved Sense of Self Importance

When a person believes and acts as though they matter more than they actually do.
John A: I'm kind of a big deal.

John B: Wow, someone's got a serious case of the USSI.
by Neenerneenerbooboo November 02, 2010

The Urban Dictionary Mug

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The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

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The Urban Dictionary Mug

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The Urban Dictionary T-Shirt

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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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