The late model Mustang guys use this phrase a lot. If you are familiar with the rear suspension design, you'll note that it is a triangulated four link setup, not unlike that used on the earlier A bodies and some other cars/kits. In this example, they are describing what happens when the system "uses up" the available compliance of the suspension bushings, and the result is a virtual metal to metal bind. When this happens, the car looses rear grip due to the immediate change in suspension bind, and the rear of the car comes around, right now. Having had a couple of these cars, it is a very real condition, not terribly friendly, pretty much impossible to recover from.
I have never heard of snap understeer, though I am guessing that it too could/does exist, I think the most likely scenario would be when something on the front binds up hard, and causes the front end to abruptly wash out.
Mark
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