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Originally found in Sumerian Tax Logs to define overdue fees (Late on Lamp Oil, some experts believe), this phrase has evolved through time. Shakespeare shunned the abbreviation, finding it impossible to rhyme with. Thoreau punched Jim Bowie in a local tavern for carving it on the table with his special knife, but Lincoln ad-libbed it in the original Gettysburg address during an uncomfortable moment in the Monologue. It meant "Laughing On Line" during the internet craze of the late 20th century, but now has been reduced to a response to the dull person you are texting to out of politeness rather than the one you are actually engaged in a conversation with, if you can call it that.
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