a person with horrendously smelly farts (as he floats like a butterfly and stings like a bee. This is derived from “Cassius Clay” which is the birth name of the famed boxer Muhammad Ali.)
According to the late Roger Mellie (that bloke off the telly) "Gaseous Clay" is the name given to flatulence assisted stools which, due to their high air content, float like a butterfly on contact with the water in the toilet pan. unfortuately, as they have a high exit velocity, they also sting like a bee
a boiling sensation or urge in the stomach caused by eating {constipation} driven foods such as beans or cheesy dishes which fills the stomach up with gas/pressure causing small {explotions} through the anus.