Ransid toilet durge. Often the consequence of 2 or more pints of Guiness. A form of crusted shit stain that lies witness to the previous passing log, often on the right side of the pan. Has been known to even 'splashback' to the rim block, but this is only possible with uncanny skill. Most often left for all flatmates to admire in full glory.
Fuck me, i cant even shift that with an elephant piss.