I know this sounds nooby but whats XD mean

[firerula]

(u no how people say stuff then xd)

 

[darkpkmn fan1]

I only found out a few days ago, i dont know if im right but i think its meant to be someone laughing. Tilt your head to the side.

XD

X=Eyes D = Mouth

This is in the wrong place and will be closed.

 

[Kasaioni]

Its either the game:
XD:Gale of Darkness

Or the motion of laughter:

X=Eyes D=Mouth

 

[blazikenXD]

its another way of saying lol

 

[Lalonde]

it is meant to be heavy laughter. squinting eyes with mouth wide open laughing.
btw, wrong section.