Definition

An intensified version of LOL that stands for 'LOL-Fucking-LOL,' used when something is so absurdly funny that normal laughter just doesn't cut it. It's the punctuation mark equivalent of snort-laughing until you cry.

Example Usage

When he said that, I was literally LFL-ing for like five minutes straight.

Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=LFL&defid=3612210)