What is Leviathon?
1.
A huge, painful turd that one manages to squeeze out of one's ass, and which then blocks the toilet by refusing to travel through the U-Bend. This beast of a shit can be nearly a foot long and two inches thick.
So one who has released a Leviathon from his/her murky bowl must then resort to putting on some rubber gloves or similar protection and remove the turd manually from the bowl and then flush it into freedom through the bend. This is usually done by snapping the turd in half.
Leviathon is an archaic word used to name 'a giant fire breathing sea turd' (Oxford English Dictionary) written about in the Christian Bible.
'Jesus Phil! You left a fuckin Leviathon in the pan again'.