one-man-band

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.

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.

The act of someone performing fellatio while simultaneously sticking their finger (or two) up your butt.

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

masturbating

The act of giving yourself fellatio and simultaneously fingering yourself in the ass.