What's so hard about saying "bg/gf" instead of the so called "so"? There's no word on this entire planet that I despise hearing more than this word. It's not even a word. Wtf is "SO". Geezz... If I had one wish, i'd wish for this word to have never existed. Okay- maybe this wouldn't be my wish but, you get the point.
Most Helpful Guy
Partner and Significant Other became a thing as marriage rates declined as well as homosexuals needed something to refer to that person they wanted to marry but couldn't. They emerged as terms broad enough to encompass spouses and bf/gf. I didn't really like Partner or Significant Other or it's abbreviation to SO but meh, it's a thing.
Although, I've never considered that someone might say SO as "soh" rather than say "ess oh" as two letters. If anyone is saying "soh" then that's too much and they are horrible horrible human beings.2
Most Helpful Girl
It's become more popular to say since we have a lot of people coming out or who have already come out as gay. But it can be used by everyone not just people who prefer the same sex. Some abbreviations die out as time goes on and new ones replace it.1