The mewing skull format developed from online jokes about mewing, a tongue-posture practice frequently discussed in appearance-focused communities. Meme creators exaggerated its supposed visual effects by pairing prominent jawlines with skulls, skeletons, and stoic profile images. The format spread through short-form videos, reaction edits, and image compilations rather than one definitive source clip. It overlaps with rizz sounds and similar confidence memes because both parody exaggerated attractiveness and social composure. The joke remains recognizable through its simple contrast between serious presentation and absurd imagery.