During sexual intercourse, position where the female recipient is upside down while the male is standing above her kicking his left leg and doing air guitar. Variation is The Backstage Pass where the guy is backward, playing drums on her butt.
My favorite sex position is the Rocking Piledriver, I love watching her face as I air guitar above her.
Trucker CB (citizens band) slang for the position of a vehicle in a line of vehicles that is neither at the front or rear of the line. A vehicle in the "rocking chair" is supposedly protected from law enforcement or smokey because it can receive warning by CB radio from those vehicles ahead and behind about oncoming (or overtaking) patrol cars, speed traps, etc.
I was in the rocking chair and escaped a speeding ticket because the lead trucker warned me of a patrolman with a radargun (Kojak with a Kodak).