This seems to be the most unknown strategy so far to me. You shoot at the boss, when he comes after you and chases you, you spam shoot stickes and right click to get a massive backwards move boost and cause massive damage to the boss chasing you meanwhile.
It's what most do more or less. It takes a bit of timing to get that backwards boost, which is why you may see many fail at trying to do it; it's a bit of a blur when you've got a boss on your tail. The damage comes in only if the boss doesn't realize what you're doing at first, which can easily do upwards of 800 damage in less than two seconds if done properly. What most do from what I've seen is try to spam them while crouch jumping(which I dislike crouch jumping as a whole), so they die from their own stickies doing 2x damage to them. But going for distance with a stickyjump isn't too hard to pull off.