This phrase can be used to mean a number of different things:
1. A totally unacceptable way of referring to a person with a learning disability; see also window licker.
2. A somewhat disparaging way of referring to someone whose behaviour can vary from eccentric to clinically insane, who is prone to do things that range from slightly strange to outrageously
weird.
3. A totally appropriate way of referring to someone, a small child or an adult with the mental capacity of a small child, such as a
female suffering from acute princess syndrome, who is prone to temper tantrums, and
will throw themselves to the ground and bite the carpet.
4. Possibly the best known and most humorously appropriate, someone, male or
female who indulges in
cunnilingus also known as muff diving. Incidentally, many lesbians refer to rug munching as “ling” (from cunnilingus) although ling is also a large, rather smelly fish, says it all really.
1. It is unacceptable to call a person with a learning disability a 'rug muncher'.
2. Malcolm is acting stranger and stranger, he always was a
bit weird but he’s turning into a right rug muncher.
3. What a thoroughly nasty little
brat, screaming because she can’t get her own way! A thoroughly nasty little rug muncher.
4. Look at those two dykes groping each other in public! Get a room you rug munchers!