Having discovered the meaning, I must acknowledge the joke is a mildly amusing play on words. What I also find amusing is firstly that the Swedes need a word to define such an activity and secondly that an Aussie knows it LOL.
I wish I hadn't bothered, it means to cry while bashing the bishop (and if you don't know what that means, then you're better off knowing nothing about Gråtrunka)
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