What does "Oh's" mean in the pop song "Ex's and Oh's" by Elle King? http://www.metrolyrics.com/exs-ohs-lyrics-elle-king.html
There are multiple possible interpretations according to contributors on Genius:
The metaphorical x’s (hugs) and o’s (kisses) of the relationships haunt her, symbolizing her running away from any actually feelings developed in the process. “XO” is a common way to sign off in love letters, or if you’re gossip girl.
Her ex’s and oh’s spark memories of a more sexual nature, which we can presume the “oh’s” to be the orgasms she gave, to whom became her “ex’s”.
Ex’s and oh’s also lend themselves to X’s and O’s of the tic-tac-toe variety, thus reinforcing how she treats her relationships like a game.