The term "xd" is commonly used in online communication, particularly in text messaging and social media. It represents an emoticon that depicts laughter or amusement. The "x" simulates closed eyes, while the "d" represents a wide-open mouth in laughter. It is often used to convey strong feelings of humor or fun in a light-hearted manner.
"xd" as an emoticon emerged from early internet culture, particularly from text-based communications where users created visual representations of emotions using characters found on a keyboard. The use of "x" and "d" dates back to the rise of chat rooms and instant messaging in the late 1990s and early 2000s.