XD means a laughing face.
The Full Answer
XD is an emoticon that represents a laughing face on a phone or other device rotated ninety degrees to the right.
Written in either lowercase or uppercase, the X represents closed, scrunched up eyes, while…
the D, always written in uppercase, represents a laughing, wide open mouth.
The XD emoticon conveys someone really laughing and is used in response to something you found very funny.
There is also an XD emoji, which you can use for the same purpose.
Where Would You See XD?
In texting… and chat… and online games, such as Roblox… and League Of Legends… and on social media, such as Facebook… and Instagram.
Ethan making himself useful as an art prop. xD
Who said you can’t look good in a photo booth pic? XD
When you text your gf rawr xD and she only replies xD.
Other XD Meanings
Disney XD (a global television brand).
Springfield Armory XD (a line of semi-automatic pistols).