French acronym meaning "Explosé de rire" which can be translated "Exploded of laughing/laughter".
It's same "mdr" and "ptdr" but in a louder way.

The fool : Ya'd know why there's night and day on Earth?
Someone : Go on.
The fool : Because yo momma's so fat when she moves she hides the sun.
Someone : xpldr.
by Renjida March 21, 2008
Get the xpldr mug.