Top Definition
The person that you think you keep seeing after a hard alcohol session ( usually two days or more ).
This is a section of paranoia you suffer as a result of drinking.
Lying in bed after a 2-3 day alcohol session sweating hard, onion man is standing over your bed supervising and wont go away.
He appears in your dreams and can be seen through the corner of your eye on occasions forcing one to constantly look over ones shoulder.
by Milosovic July 14, 2006

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Describes someone who doesn't take a shower for days at a time. Their oder gives off a very strong onion smell, that can be smelt from multiple yards away.
Onionman will you please take a shower before you get into my car or come over my house.
by Jon Death Murphy April 18, 2009

The Urban Dictionary Mug

Lotsa space for your liquids.

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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