...a term used to describe a technique that works especially well with the Minelab machines. It's particularly effective with the Sovereign machines but also works with the other metered Minelabs.
The idea is that on the deeper targets, the indicated numeric value (and possibly the tone as well) may be a little on the low side for what the target actually is. For example, if a quarter is normally a 38 on the Quattro...which it is...but because a particular quarter is maybe let's say 12" deep, it only reads 32 or 33. But as you sweep over it, you can see it wanting to climb a little, maybe bouncing to 36 or 37. So you want o try to "massage" the target a little, to see if you can get the numeric value and the tone to "climb up". So what you do is to zero in on the target...get your coil right on top of it. You may use the pinpoint to do that or maybe not, if you're good with it. But once you are sure you're right over it, there comes the wiggle. And it's not done in pinpoint...you do it in ID mode. With the coil directly over the target, imaging that the hand you have on the grip is actually holding a pair of dice you are getting ready to toss. And you are shaking them prior to the toss. But the coil isn't swinging back and forth anymore...it's RIGHT over the target...on top of it. And you're wiggling the coil by doing the little dice shaking thing on the shaft grip. That's the best way I can explain it. And maybe while you're doing that, you can move your body around maybe 90 degrees or so either way, to get on the other sides of the target as you wiggle. If done right, you can get that signal to "rise up" to it's best tonal and numerical value. The idea is to either decide whether to dig or not or to get the best possible ID of what it is that you're about to dig. Usually, if you have a target that sounds even close to good that is fairly deep, it's a good idea to dig it anyway. But for those that like to really be sure of what it is they're digging and to get the science of detecting as exact as possible, the wiggle is a tool that can help.
I will say that in my opinion, the wiggle is of less importance with the Quattro. Although it will work. But when I had my Quattro I noted that it seemed to ID very accurately even on some of the deepest stuff. It "locks on" better at depth than some of the other Minelabs and thus the wiggle is a little less critical. I use the wiggle with my Excalibur at the beach quite a bit.
Hope that helps...