An adjective used by James Lipton in X-Entertainment's Advent Calendar series, roughly meaning very good, exciting, astounding, etc. It is (apparently) a mixture of remarkable and tremendous or stupendous.
MISTA SNOWMAN: ...and then, at the end of the show, there's this big storm, and things are looking pretty grim... ...UNTIL RUDOLPH SAVES CHRISTMAS WITH HIS BIG SHINY NOSE! CAN YOU BELIEVE THAT SHIT?
JAMES LIPTON: NO I cannot believe that shit! Simply remarkablous -- I would not mind hearing that story again!
Coined from the term Merk (or Merc depending on geographical location) made famous by Manchester United Centre Back, and original prankster, Rio Ferdinand.
To Merk someone is to make a fool of them, however if something is remerkable it means it is so good you want to do it multiple times.
Dayuum, that gurl be truely remerkable.
Wayne, you look a total fool! You totally thought you ran over that puppy! You got Merk'd and that was Remerkable.