Gununu (ぐぬぬ) is a Japanese onomatopoeia representing the sound of someone gritting their teeth in frustration, anger, or suppressed speech. The meme gained significant traction in the mid-2000s on Japanese message boards like 2channel and art communities like Pixiv, often featuring chibi versions of anime characters, most notably from the Touhou Project series. The visual style typically depicts a character's face shaking with a distinct expression of impotent rage or stubbornness. Today, it is widely used across the internet to humorously convey minor inconveniences, jealousy, or the feeling of being outplayed while remaining undeniably adorable.