What is do i look like i know what a jpeg is?

The phrase "Do I look like I know what a JPEG is?" is a humorous rhetorical question. It's used when someone is being asked to perform a task or explain something technical (like the JPEG image format) that they clearly lack the expertise to handle.

The humor derives from the implication that the speaker's appearance or demeanor should somehow indicate their level of technical knowledge. It's a self-deprecating way of admitting ignorance while also subtly deflecting the request. The statement plays on stereotypes and expectations about who looks like they would understand technology. Usually, it's said with a tone of sarcasm or mild exasperation. It's frequently encountered online as a meme or reaction image.

Fundamentally, the phrase isn't actually about JPEGs at all; it's about expressing a lack of understanding and politely refusing to engage with something perceived as overly complicated or outside one's skillset.