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Whilst it is obvious that no "other" can be of any significance whatsoever, the self-help book market found it to be a valuable tool for sales and soon sincere, direct expressions such as "my spouse", "black person" and "the child I abducted last week" were replaced by "my significant other."
The phrase is commonly used in Genital Herpes commercials to make women believe that having sores in their twats won't prevent them from finding love. Usually barfed by hipsters, homosexuals and bitter divorcées after a couple of Martinis, significant others are artificial extensions of the aforementioned douchebags, much like a prosthetic arm or dildo.
Recent findings show that most significant others are both imaginary and unaware of the fact that someone out there believes that he/she is in a sentimental relationship with them. It has been statistically demonstrated that people who have significant others are more likely to die of cancer and AIDS than people who have unprotected sex with niggers once a month.