Girls, "sack whacking"? Is this some sick game kids play these days?

Anonymous
My son was in tears today when I picked him up which is not like him at all, he is quite a tough boy but when I asked him why he was crying he wouldn't answer me but my daughter said from the back seat "Ariana sack whacked him for a Tiktok". He goes to school with this Ariana and my daughter said it's a trend on tiktok that the girls at school are doing to the boys but I couldn't get any of them to tell me what it means and why my boy was crying and went straight to his room because of it!
Girls, "sack whacking"? Is this some sick game kids play these days?
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