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
1 more definition
5 Words related to onion man
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

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