Choot-a-woot can be used in various ways.
Can be used as a greeting, expression of disapointment, excitment, or whatever else may be fitting. Aslo can be used to agree with and idea, saying, or action.
Walking down the street and see someone, but have no time to talk to them: "Choot-a-woot"
Monty is on the London bound train heading to a corporate meeting
shouting into to mobile phone so that the whole carriage can hear him
Monty: "Yah Penry I'm on the way to the City"
Monty: "Yah head office meeting Penry"
Monty : "Yah Penry sitting in 1st class just having a cup of " Camp a Choo Choo" while en route"
Monty: "Yah see you there Penry"
The act of pelvic thrusting and pumping while at the same time moving your arms as if to simulate a steam train.
Most often used when fucking a midget.
Very classy move!!!