Meaning
A moai, one of the giant stone head statues of Easter Island, or Rapa Nui, with a long face, heavy brow and stern expression. It stands for ancient monuments and stony stillness.
Online it has become a deadpan reaction meaning unimpressed, speechless or keeping a perfectly straight face: “You really thought I’d fall for that? 🗿” It also suits travel posts and history trivia about the island.