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a way to use ROFL as a superlative degree of adjectives. for example, an adjective such as old or green would be oldest or greenest.

but in the case of ROFL, ROFLtriousnest implies that the event, person or thing was the most funniest thing that one has experienced, even transcending the user from just the "rolling on the floor laughing"
Example 1.
Guy 1: OH my god, i just saw a black dude have a heart to heart with the song 'The Climb'

Guy 2: Rofltriousnest!

Example 2.
Girl 1: I just saw an asian guy crashed his bike into a bike rack.

Girl 2: really? Rofltriousnest!
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