It's the technique that makes a lure zig-zag side to side across the water on retrieval. The trick is to get as much movement as possible whilst minimising the speed of retrieval. Lures such as the Zara Super Spook are used. Best in calm conditions. If you google 'walking the dog' you should find some vids of it. Rapala has a vid of their lure actions on their website to.
Cheers
FlyGuy