SO
SO has 2 meanings
Significant other
Example
My SO and I are both planning to go to the play with you guys
SO definition by Slang.net - The Slang Dictionary
This page explains what the acronym "SO" means. The various definitions, examples, and related terms listed above have been manually compiled and written by the Slang.net team.
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Are you financially literate?
Those lucky enough to be in a romantic relationship use the acronym SO to refer to their "significant other." A person's significant other is their romantic partner. Notably, the term SO is gender-neutral, so it can be used to refer to a person's bf, gf, husband, wife, or other type of partner.
As you might expect, you're most likely to encounter the SO acronym when talking with someone who is part of a couple. Some couples refer to each other as SOs simply because they prefer the term to its alternatives, while others do so to avoid "defining" their relationship too early.