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!