LOLer

noun2

1. •
   (Internet) A person who uses the expression LOL (laugh out loud).

   • Perhaps the worst offender is the LOLer who has no grasp of nuance or subtlety. He's like a comedian who comes down from the stage to sit on your lap, tell you a joke and then say, 'Get it?' — 2009
2. •
   (Internet) Something that causes one to laugh out loud.

   • And the classic... Elizabeth died..of many causes scene... LOL that one is a LOLer from beginning to end. "I'm famished, anyone want a tuna on rye?" — 1999