Internet slang for hurt(/ing) myself laughing to express pain in finding something funny, either from being sore in the stomach muscles from laughing so much, from finding it hard to breathe from laughing too hard, or from falling off your chair while laughing. Can be used in instant messaging with people who are allergic to the phrase lol. Alternate versions: hyl (hurt(/ing) yourself laughing), hhl (hurt(/ing) him/herself laughing).
person a: and she says "what's a sex toy?"
person b: ow!
person a: hyl?
person b: no, just electrocuted myself.
person a: hml
Person 1: he literally hhl
Person 2: seriously?
Person 1: yeah, he didn't see the stairs he was laughing that hard
Person 2: hml!!!!!