What The Heck is A “Situationship?”?

I’ve seen this term used a few times here on GaG, and now I saw it once on a published article over the last week. What does this term mean and why has it come to be?

In other words, what makes a particular connection to another person so that a widely accepted term such as boyfriend/girlfriend, fiancé/fiancée, husband/wife, spouse, and so on isn’t adequate to explain the dynamic?
What The Heck is A “Situationship?”?
Post Opinion