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1.
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 02, 2006
 
2.
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 04, 2004
 
3.
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 26, 2008
 
4.
The act of giving yourself fellatio and simultaneously fingering yourself in the ass.
Wow that dude sure loves the smell of his own farts. He is really flexible too. I bet he sits at home at night playing his one man band.
by inagadadavida November 10, 2012
 
5.
My mate Derik is in a one man band he's the man who plays the tuba, saxaphone, harmonica, banjo, marackas, triangle, drums, electric guitar, kazoo, base guitar, grand piano, bag-pipes, oboe (no not hobo!), bongo, bassoon, clarinet, flute, jug, piccolo, recorder, surrusophone, shawm, slide whistle, Alphorn, Baritone, didgeridoo, Sackbut, Trumpet, Trombone, Fiddle and Violin, Accordion and Pipe organ aswell as spanking a donkey, wearing turtle shell, cooking a goose with the power of his own self-satisfaction, riding a bike into a pool of dancing mooses and smoking a 15ft pipe with his ass
by harry July 19, 2003
 
6.
masturbating
He's used to having a one man band at this hour of the night.
by Anonymous July 11, 2003