Since people type 'lol' at only slightly amusing things, that did not actually provoke genuine laughter, people now type 'lolirl' to signify that they genuinely laughed out loud, in real life. Nerds.
usually when people say lol they are not laughing irl, but when you say lol irl, you are laughing really in real life.
Annie: Who's there?
Maggie: YO MAMA
Annie: OMG I just snorted and spit out my coffee! lol irl.