What is cistern shuffle?

The practice of excreting into the cistern of a toilet.
Take the lid off, do your business, lid back on and flush! The number2 will go through not only the flush water but through most of the toilet plumbing and stink for ages. I've seen it done! Classic

I was at Alex's house warming last Saturday night, and I dropped a cistern shuffle in his toilet, his plumbing is screwed.

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cistern shuffle - video