ROCL is an internet acronym for Rolling On Ceiling Laughing, and like all things internet it has adapted to nerd culture and has taken on new real-life use, though usually in a satirical way.
<Admin>Rocl? Hm...now what the heck does that mean?
<Noob>Why roll on the floor while laughing? That could get you dirty. You might as well roll on the ceiling...
<Noob>Yeah! You got it!.
Most common when a group of people are in a cotchment, having a lol, possibly intoxicated, and a member makes a joke, causing all members of the group to fall back, collapsing around the cotch, causing a mass ROCL.
= "Its in my mouth"
*all members rocl*