Used in polyamorous contexts, a person's lover's other lover. A partner's partner, the person your sweetie is banging, etc. Unlike mistress or paramour, "metamore" connotes that neither relationship is clandestine.
There was a lot of tension in my relationship with Joe, so I had dinner and talked through it with a metamour, Casey. They were able to bring a lot of perspective, and things with Joe really smoothed out. The next week we made an Eiffel Tower.
Now that I'm dating Ludacris, I have metamours in every area code.
An empathic metamorph is a creature perceived to be the "perfect mate" by changing its persona and behavior to meet another being's emotional requirements and sexual desires. It achieves this using a subtle form of telepathy which is more akin to empathy.
v. Turning itself into shit. Also metamorfeces (US).
Steve: You looking at XYZ Oil Co?
Alan: Y'know if crude oil drops any further, I reckon this thing just metamorfaeces.
Steve: Yeah, think we cut our losses on this one.
Stu: So, reckon the Lib Dems have a chance in next year's UK elections?
Rick: Their leader has no chance. As of next May his career metamorfaeces.
Stu: And the party too, I'd say. Another pint?
A person who is not only a big mouth, but one that can't stop talking about themselves. Every conversation seems to loop back to 'them'.
Jesse: So, this has been the week from hell.
Chad: Fuuuuck... I've been there, I know what you're going through.
Jesse: Uggghh. My wife threatened to divorce me on Tuesday.
Chad: Oh, I went on a date last week... and she would not put out. Fuck that chick!
Jesse: Then my car's transmission went out.
Chad: Fuuuuck. I had a flat last month. Took AAA almost an hour to fix it.
Jesse: And my dog died.
Chad: Fuuuuuuuck. I know man. I had a goldfish die on me when I was ten.
Jessie: Your fucking goldfish?? You... you are a self-centered metamouth!! My God! Why do I come here every week?? You're the worst shrink I ever had.