D人日日講XD 其實係點XD係解

其實XD係要側個頭睇,你就會睇到隻眼打交叉,跟著個嘴係到笑

XD係影相用的memory card law
我之前用FUJI的相機都係要用XD卡架!

Just an addition of upstairs answer (upstair answer is very good indeed XD)
In digital world, it can mean XD picture memory card for camera.
http://en.wikipedia.org/wiki/XD-Picture_Card

x係眼
D係口

你見到嗎??