Cistern job
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The act of removing the lid off the back of the toilet and planting a stool in the [cistern] to spite an ememy. The easiest way is for the perpetrator to [perch] with their feet on the toilet seat and poo directly into the cistern. Often seen as one step further than a reverse kanga or crocodile skiddy as everytime the victim attempts to flush the toilet to rid it of its contents it refills from the cistern with a cruel mix of poo and water. Particularly effective as it is often not noticable straight away as there is no [actual poo] in the bowl but fills up over time making it hard to find out who did it.
Cistern job meaning & definition 1 of Cistern job.