The Brief: Big mood means "relatable."
The phrase can be used on its own as a caption to a photo or video, or as a part of a sentence, as in saying that something “is big mood.” It is synonyms with and possibly an evolution of “mood.”
big mood pic.twitter.com/Hq01JG4dnv
— Phos Marked For Death (@Phosphatide) January 29, 2019
Dua lipa wearing a massive bubble coat is a big mood today pic.twitter.com/Ae8Sf2R14M
— Jack mull (@J4CKMULL) January 30, 2019