What is Roflsaurus Rex?
1.
A dinosaur of a status of rolling on the floor laughing
"Oh my god that is so funny! Roflsaurus rex!
See
2.
Pronounced rah-full-sore-us rex; Someone acting like an idiot or someone being incredibly stupid... so stupid that it's funny.
"Look at that roflsaurus rex."
"What a roflsaurus rex."
"Oh my god, roflsaurus rex."
See