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
<loser> Why did the chicken cross the road?
<loser> To get to the other side!
<someguywithnolife> belgianrofls!
by gaselite June 10, 2004
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