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1.
A particularly nasty shit that is neither solid nor liquid but more of a slimey,pudding-like consistency.A mud island tends to float high in the bowl due to its fat content.
I just crapped a mud island.
by wolfbait51 June 08, 2011
 
2.
a rare, yet massive pile of poo that fills the toilet until there is an island of poo exposed to the air in the bowl.

also an entertainment area of memphis tn.
Jimmy - i just left mud island in the bathroom

Cindy - What?

Jimmy - Go look.

Cindy - Oh My God! that is a pile of shit in there, you are sick!

Jimmy - Not any more.
by Harry Day June 10, 2010