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.