situationship
noun
sit·u·a·tion·ship
ˌsi-chə-ˈwā-shən-ˌship
plural situationships
slang
: a loosely-defined sexual or romantic relationship between partners who are unclear about the exact nature of the relationship in terms of the other partner's level of commitment and future expectations
a messy, complicated situationship with a roommate
Rather than seeing situationships as a trap to be avoided, daters are now embracing the idea that some relationships don't need to be rigidly defined.—
Myisha Battle
also
: one of the people in such a relationship
… spends his days drinking, calling his mother, and occasionally seeing his situationship … —
Tori Potenza
Love words? Need even more definitions?
Merriam-Webster unabridged



