to release an oily water-like substance out of the anus, after consuming low to non-fat foods, such as WOW chips.
by chipper December 22, 2003
Check out the side effects for a medication. If it states "Oily Discharge" as a high possibility then put it down. Walking around Wal*mart all day with mud butt is not worth getting rid of whatever the hell is wrong with you.
by iwannabeanalcoholic March 26, 2005