A sign of laughing or happiness, originally from the internet as it turned upside down is a dying laughing face.
XD That was wonderful
A way to express the bossy and funny emotion
eg1. person 1: that guy we played with was soo good man...
person 2: well not as good as me xD
eg2. person 1: I saw a begger down the street and he looked so poor man... I felt bad for him.. must be tough living
outside
person 2: hm hmm, then why didn't you take him to your house xD just kidding...
An over-used text-face that is usually the fastest way to find out someone's I.Q. Kids usually use this to look cool, but it just means they're lonely and if you point it out they start failing to roast you because they say "xD" in every sentence.
Right way -
Person 1: Knock Knock
Person 2: Who's there?
Person 1: Doctor
Person 2: What the f- Doctor Who?
Person 1: Doctor Pepper
Person 2: OH! xD
Wrong way:
Person 1: xD I GOT A 2 KILL STREAK xD XD XD
Person 2: XD
Person 1: I died XD
Person 2: XD
Person 1: I've been kidnapped and the ransom is £100000 xD
Person 2: XD THAT'S HILARIOUS