Basically when two people are together, without the official title. Includes relationship-like habits, but an individual caught up in "a thing" with someone is technically single. It is often the step before a relationship.
1. PersonA: are John and Sarah dating?
PersonB: They have a thing / thinging.
2. Sarah: why are you talking to Jasmine all the time?
John: chill out, you're not my girlfriend, I do what I want.
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