SO
SO has 2 meanings
Significant other
Example
My SO and I are both planning to go to the play with you guys
Related Slang
| bf | Boyfriend | 
| gf | Girlfriend | 
| FW | Future wife | 
| Hubby | Husband | 
| Cuffing | Linking up in a relationship with a person | 
| Throuple | A romantic relationship between three people | 
| Deal breaker | An issue that breaks up a relationship | 
| DTR | Define the relationship | 
| LDR | Long-distance relationship | 
| Relationship goals | An admirable relationship | 
Categories
Strikeouts
An abbreviation used in baseball statistics to count the number of strikeouts by a pitcher or batter.
The SO abbreviation is commonly used to measure a pitcher's efficiency along with his ERA, W, L, and CG. It also appears in a batter's statistics to measure how well he is hitting. The SO abbreviation can be used interchangeably with K to keep track of strikeouts.
Example
He threw a CG with 11 SO for the W
Related Slang
| K | Strikeout | 
| CG | Complete games | 
| ERA | Earned run average | 
| avg | Batting average | 
| RBI | Runs batted in | 
| hr | Home run | 
| W | Win | 
| L | Losses | 
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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.