The moment you have the talk about going from hooking up to a relationship. Might be awkward to initiate, especially if the two parties aren't on the same page. The "SO" refers to "significant other." Often involves phrases like "Where do we stand?", "Is this going anywhere?", and "Let's DTR."
- Chris: "I had the So... moment with Lisa the other day."
- Will: "And??"
- Chris and Lisa in unison: "It's official!” (holding hands)