Comes from: Fly (Bird) + Bitch (Dog) = Flybitch (Birddog)
Reed: Where?... Oh ya definitely a birddog, I'd smash!
Performing the task this way should save time, effort or money.
It can involve a dangerous act in order to get the job done.
An example of bird-dogging it would be an electrician climbing on a live switchboard to get to a cable, j-boxing a cable in a wall cavity, shorting out a circuit in order to identify the right breaker or setting up a ladder on the back of your ute to reach reach higher