an internet term similar to 'lollercoaster' or 'lollerskates', used when one wants to emphasise a particularly funny comment or joke.

belgian pronounced normally
rofls pronounced like waffles

Briefly, "the realization that each random passerby is living a life as vivid and complex as your own." Originally from the Dictionary of Obscure Sorrows, which has a lot more beautiful neologism definitions like this you might enjoy.

A lol or rofl that goes beyond the typical and into the extraordinary. Also can be a rofl that takes place in Belgium