It is a term used to express a great deal of humor Lolttm means laugh out loud to the maximum. Also when you're texting it can be a word to end the conversation
An abbreviation for "laugh out loud throw a midget in a river." Often used when rofl and lmao and lol get old. Also commonly used as antihumour, to make the reader seem like a complete noob.
-Did you see that video of a walrus doing sit ups?
-Yeah, loltamir.
LOLTTM: An abbreviated term for the phrase, Laugh Out LoudTo The Max! usually used to express ones need to roll around on the floor, perhaps whilst eating waffles (see ROFLEW