What is Big Muck?
Two flattened turds in a bap, covered in bloody pus and soggy mould, available for purchase at a well-known burger chain. Consumed with enthusiasm by plebs who would eat their own bowels if they were packaged in a gaudy fashion.
"Greetings fresh-faced burger bar attendant. Kindly poison me with a Big Muck, if you would be so kind." - "Certainly sir and would you like some scabby fries with your shit or shall I just puke in your face?"