an acronym for "lover and mistress
marriage", this term is used to define:
a): a specific type of
marriage (not to be confused with an open
relationship, where cheating is, mostly, mutually consentual and often the couples involved are in common-law or civil marriages) where the partners are, legally speaking, fully married, and are neither legally separated nor divorced, and still cheat on each other. Since this is not an open relationship, it can only happen when one or both partners are ignorant of the fact that they are, or may be, cheating on each other.
If neither of the partners involved are ignorant of the cheating, they should not be deemed to be an open relationship, but should be
seen to be as mutually adultrous and in a lamm but choosing to do nothing about it, which is absolutely their right, since the legal should not get involved until someone decides to file charges.
b): a neutral or pejorative term, depending on the context, for a movie,
book, newspaper article or tv show where the plot revolves around a couple in a lamm
marriage.
An epitomy of such a scenario would be the movie Mr. and Mrs. Smith.
two people are in conversation
person a): did you see the movie Mr. and Mrs. Smith with Brad Pitt and Angelina
Jolie?
person b): yup I did, I thought it was a lamm, that's what I found so funny about it.
person a):
lol, I even heard that Brad Pitt and Angelina
Jolie are in a lamm in real life as well.
person b): wtf? did you just say that? I find it hard to believe. Tone it down, you are really living underwater.