Definition
Thoroughly; completely, comprehensively.
How People Actually Use It
To go forward in a normal walking motion, and then going back into the original place but with a reverse walking motion without looking back It's the same as backtrack, but without looking back. or if it's a video, it's to speed up the video and then reversing it (and change the speed back to normal) after some time
"Go forward and backward!"
Source: Urban Dictionary