I think it differs so much that a definition can't be else than vague.
You could see it as a 'soul accident'
The scars are deep and will never disappear fully might be an indicator for the category.
As you might have read: it's not necessarily a bad thing, as a 'slap' might be a wake up slap, or a slap against unconsciousness, or slapping the 'old stage' to get evolution going, yet it is a slap and it hurts, and that can reach up to truly torment levels.
Most people report not to regret the event according to gaining net positive results, but the means are not exactly nice. The prize to pay for a taking a shortcut?
Keep your fear for hyperslap grounded please, it might feed it. Like being afraid to ride a car in fear for an accident might cause overly stress, when it's better to ride more relaxed. Life is not without risks, and people get out of hyperslaps physically unhurt.
I've noticed people in search for a non-hurt life, avoiding carefully every risk, and notice they get hurt eventually as part of life, no escaping. Paying a shortcut prize might, in cases, be less 'expensive' after all. But I'll not seek for it. The rabbit leaves his hole from time to time, or is afraid to come out and dies in the hole underfed. As I see it.