A significant other whose status is not created by a agreed-upon relationship status but by how much time is spent with them. Could also be considered a behavioral significant other.
Combination of "statistically significant" and "significant other."
Since he spent twice as much time with Karen as with any of the other girls he was dating, his friends called Karen his statistically significant other.
A significant other defined by an (undesired) medical condition, not by a agreed-upon relationship status.
Combination of "clinically significant" and "significant other."
They were only dating casually, but when he gave her the Clap, he became her clinically significant other.
An ex-boyfriend or -girlfriend who is your enemy, nemesis, or at least a big pain in the ass.
My exemy never looks me in the eye at common social functions and never fails to undermine me publicly when he gets the chance.
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