Acronym for "Significant Other
Show-Off".
The kind of person that flaunts their relationship status and treats it more as an accessory than anything. They pretty much make their relationship about 90% of their personality. This is the person who makes it very clear that they are already taken before you can even introduce yourself. Everything they do somehow involves their partner. Their social media walls consist almost completely of pictures of them and their SO,
ramblings of how "In love" they are, or repeating for the fifth time that they are "Theirs and only theirs
"Have you seen
Stacy's page? All she ever posts are pictures
and love poems about her boyfriend. She's such a SOSO."