Top Definition
An evil supernatural force that lives within cyberspace and randomly rejects sent emails for no apparent reason.
Dave: Did you email that hottie from Craigslist about hooking up this weekend?

Ryan: I tried but the mailer-demon apparently is already dating her...because he sent it right back to me.
by Not John Vallone November 04, 2010

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