Said as it is spelled ( e.g. Raw-full) not as an acronym* ( e.g. R-O-F-L). Means that something is so explodingly funny, that you do not stop laughing for at least thirty seconds.
*Comes from the acronym ROFL meaning Rolling On Floor Laughing
Jim: Oh my god, I just scared my and it ran into the wall!
Mike: Holy crap! ROFL Rockets.
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