Jeffy is the loud, childlike puppet character from the SuperMarioLogan YouTube comedy series, where his whiny voice and over-the-top reactions made him a breakout fan favourite. Short clips of his groans, screams and catchphrases were lifted into meme edits, TikTok videos and soundboards, where they work as instant shorthand for frustration or disbelief. Because the groan needs no context to be funny, it has stayed popular with creators who want a quick, recognisable reaction sound.