Originally Posted by marksbabygirl
You'll have to scroll down to the bottom to see Dan Savage's explanation.
According to my Firefox add-on and anti-virus, that link you posted leads to a spam site (there are two "https" in the URL) so I wouldn't open it. I'm guessing that was just a mistake though.
Anyways, from what I've read, "monogamish" seems to be located in that grey area between an open relationship and a monogamous one: Occasional infidelities wouldn't necessarily lead to the threat of a breakup. The distinction between being monogamish and being in an open relationship, is that an OR is more about having the "freedom" to sleep with others if you so desire (proactive), while being monogamish is more about acknowledging, understanding, and being more lenient towards your partner's infidelity (reactive).
^ I have no relationship experience beyond polyamory and some very light swinging...so that may be completely wrong, and I may be full of it. But it seems to me that being monogamish and being in a poly/swinger/open relationship is quite a bit different.
The word I'm thinking of would refer to a person who has a flexible sense of fidelity.
Good luck with your diet btw.