The speech bubble meme — also called "speech bubbling" or "word bubbling" — is a reaction image format that originated on Tumblr and 4chan around 2015. It went viral on Discord in late 2021 and has since become one of Reddit's most popular image reply formats.
The concept is simple: take any photo and overlay a cropped white speech bubble on top. The bubble has no text inside. When you post the image as a reply on Reddit or Discord, the white area blends into the page's white background. The result? It looks like the character in the photo is "speaking" whatever comment or message appears above the image.
The tail of the bubble points at the character's mouth, completing the visual illusion. The format works because Reddit, Discord, and most social platforms use white or light-gray backgrounds by default.
Related reading: How to Make a Speech Bubble Meme (Step-by-Step Guide)