Real adults, at least the ones who are smart and honest, do just that. If they’re not in a relationship with a person, but they are dating, they won’t say, “Oh, me and this girl have been kicking it hard, we’re in a situationship.” Even someone like me, who stays in a situationship, would never actually use the word at least, not seriously.
There’s nothing wrong with having fun on the account of the English language. Whether your name is RL and you used to sing in a group called Next, or you’re a renowned author named Phillip Roth. Our language is made to manipulate. But to make up words and add them to a relationship thesaurus, just so we can feel better about what is or isn’t going on between us and another person is doing ourselves a disservice. Made up words and mashed up words are best used for creative purposes only, and if we ever have the urge to resort to them in any type of serious conversation, we have probably come to the point where what we say isn’t quite true and our words should probably give way to action.