1. A one-man war is when one person fights against an opponent consisting of several people by himself/herself.

2. It can also be used figuratively, to say a person is fighting against a matter that other people supports by himself/herself, at least with a lack of support for his/her opinion.
1. "He launched a one-man war against police."

2. "He launched a one-man war against graffiti."
by youngchimp November 30, 2012
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Sexual act involving masturbating a girl, then having hand fall into the vagina without much effort. Man then begins to make thumb war motions inside girl. Works best on a loose girl.
I was totally getting it on with Darcy, and I put my hand down there, but it was a total one man thumb war not even a minute in.
by Kegan Godbey August 16, 2005
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v.To masturbate aggressively.
Gareth eventually won the one man tug-of-war. It was hard going. But, in the end, he was covered in muck anyway
by Geoff Scotland February 19, 2006
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