The 'IDK' Punchline meme relies on the meta-humor of using the acronym 'IDK' (I Don't Know) as both a question and its own answer. This specific trope often features a person asking for the definition of the acronym, only to be met with the literal definition, which they mistake for a lack of knowledge from the respondent. While the joke has existed as a classic 'Who's on First?' style linguistic gag for decades, it transitioned into the digital meme world through webcomics and viral text message screenshots. It perfectly captures the frustration and comedic timing of miscommunication, making it a staple for internet users who enjoy wordplay and ironic circular logic.