Adapted, drawn out versions of chat speak. For instance, one woman I am FB friends with, who is normally rather sane, will type out 'LOLOLOLOLOLOL' if she finds something really funny. It can range from "LOLOLOL' to longer than my first example. Tonight something made her laugh, so she typed out 'LOLOLOLINGOL'.
My English loving, desperate to save the language mind screamed 'What the HELL?"