LRLIMH
Laughing Really Loud in My Head: SMS/Online Jargon used specifically when someone says something thats very amusing but the observer is unable to make any noise. Say, in the exam room, or late at night when the folks/family are asleep:
Uncle Ruckus is SOO dumb! Utah isn't a country starting with the letter 'U' Better not laugh in his face! .....LRLIMH!