It stands for crossed penises, with X, representing the shape of the two dicks and D, which means penis.
Wow, look at the XD those two guys are making!
3๐ 3๐
Laughing so hard that I am drooling.
Me: I dropped my phone in the toilet and it took a picture of my butt, see?
You: XD~
9๐ 18๐
A laughing face similar to :D, but with its eyes closed. Alternatively written as xD, if you want to look cooler.
Some peeps thought I had friends XD
2๐ 2๐
xdxdxdxddxdxdxdxddxdxdxdxdxdxdxdxdxdxdxdxdxdxdxddxdxdxdxdxdxdxdxdxdxdxddxdxdxdxdxdxdxddxdxdx
3๐ 5๐
normally used as a noun ("that's funny xD"), xD can also be used as a verb, meaning 'to laugh'
53๐ 168๐
Usually used to decribe the feeling of something stupid, or dumb.
Randomperson: Dude, I cannot believe i just said that.
Me: Xd
35๐ 115๐
Someone who's generally humored by the thought of internet jokes or random occurrences that make no sense what so ever.
Niglee: OMG Hannah, potato frarl! Hannah: HAHAHA XD
3๐ 5๐