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
This page explains what the acronym "SO" means. The various definitions, examples, and related terms listed above have been written and compiled by the Slang.net team.
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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.