Meaning
Like the neutral face, but the eyes are flat lines too, as if squeezed shut in exasperation. It pushes past blank into fed-up: tired patience, speechless annoyance or being completely unimpressed.
It fits moments that leave you without words: “The meeting that ‘could have been an email’ just got extended another hour 😑” Friends use it for comic exasperation at each other’s antics. Because it reads more irritated than 😐, sending it in response to a request at work can sound like a reluctant sigh.