Delicate, lacy, fairy-like strands of foecal matter which hold individual turds to the inner lining of the large intestine and/or colon.
"Damn, girl, the inside of yo ass be coated with fecal mousse."
" 'Food and pussy, fella,' said the leader of the turds, now barely clinging to the wall by one pseudopod of fecal mousse..." -Jonathan Franzen in THE CORRECTIONS