It stands for crossed penises, with X, representing the shape of the two dicks and D, which means penis.
by WTF123@STFU.com September 5, 2016

XD I'm dead inside XD
by Czech Me Out January 15, 2018

by buzzz March 31, 2009

A laughing face similar to :D, but with its eyes closed. Alternatively written as xD, if you want to look cooler.
by Grobur April 4, 2016

xdxdxdxddxdxdxdxddxdxdxdxdxdxdxdxdxdxdxdxdxdxdxddxdxdxdxdxdxdxdxdxdxdxddxdxdxdxdxdxdxddxdxdx
by qazxswedcvvfr June 9, 2018

by Denmark June 21, 2004

by StarmanHaxor December 8, 2004
