When a grown man decides to make sensual romantic mastabatory love to his own penis in the confines of his dorm room/MAF SRT room. This "party" usually occurs while the lone man is vigorously crying and listening to Mariah Carey's new smash hit "Touch My Body."
"Hey Woodward, you wanna come out to the club and pick up chicks with us tonight?"
"No man, I think I'm gonna drink a protein shake and have a one man party."
by G stein April 11, 2008
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a person that, by themself, makes music containing multiple parts, either by use of playing several instuments at once, or by layering their pieces of music overtop one another.
Andrew W.K.'s multiinstrumental abilities allow him to function as a one-man-band.
by andrew w.k. May 5, 2004
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"One man gang" refers to a particular type of Gangsta which is independent, who relies on nobody but himself. You can be certain that any man who is a "one man gang"; can push drugs, defend himself and initiate attacks without hesitation. "Playas" considered in this category have a distinct lack of fear that allow them to carry out their plans without hesitation, a feature many envy.
Billy: "Yo, you hear what Tommy did yesterday?
Marcus: "What?"
Billy: "He robbed a drug dealer blind..."
Marcus: "Damn that Tommy sounds like a One Man Gang"
by PiggyB September 22, 2020
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A "one man band" is something that is performed on a girl. Other definitions here say it's when a guy gets a finger in the butt during a blowjob, but 2 things hardly constitutes a "band."

My understanding is that a one man band is cunnilingus plus the shocker. That is, sucking or licking the clit while using index and middle finger inside the vagina, and the pinky in the B.H.

I also hear it's pretty awesome. I don't have a vagina so I can't be sure.
Girls have been known to blackout from a one man band. Use with caution, my friend.
by Mr. Bogart January 27, 2008
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The act of someone performing fellatio while simultaneously sticking their finger (or two) up your butt.
Greco: That bitch from last night was nasty- she gave me the one man band in the back of my car.

Hung: I know dude, I was driving.
by DaddyPants April 2, 2006
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A one man army; a loner, a gangster with no mates
The guy you see parked up at your local retail park without mates
by The pork chop Express January 10, 2005
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When your boyfriend aka "The Fox" has sex with you for over an hour. It's like a train was happening but with only one person.
My boyfriend ran a one man train on me last night, and I am exhausted.
by Pinksyringes June 24, 2014
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