Top Definition
When you're so extremely tired that you begin to get loopy.
Oooh mannn I'm nerpin', I should probably sleep or I might do something bizarre.
by Milkywayyyyyy December 10, 2010

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It is what you call your nipples when they get hard.
Friend: dude, your nipples are hard.
Me: how about that, I'm nerpin.
by Dizymay_93 November 26, 2009

The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

The Urban Dictionary Mug

Your favorite word on a white mug.

Create a mug

The Urban Dictionary Mug

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

Buy the mug

The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

Buy the t-shirt

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