Something or someone that is absolutely awesome, or has acheived a pioneering level of awesomeness to that extent that normal words don't truely justify the level of greatness. Often shortened to "fraj", supercalifraj is only used in extreme cases of amazingness.
Something that is beyond awesome, dopeking, or has acheived a new level of coolness beyond comprehension.. unreal, insane, "are you fucking kidding me awesome"... often shorted to "fraj" (a derivative of Supercalifraj)
If something or someone acheives an even greater level of awesomness (this is a VERY VERY rare event), this can be described as "expeealadoush" (see seperate definition).
Jimbo, when you jumped on stage with the Stones last night and Mick said you were his inspiration when he wrote honky tonk woman, that was totallllllllly supercalifraj
Friend 1: Last night was the best night of my life, it was supercalifraj
Friend2: I agree, It was totally fraj
Friend 1: Fraj-out
Dave: dude did you see that chick i just pummeled?? she is hands down the most supercalifaj ( "fraj") chick i have ever! Ben do you concur?
Ben: Duuuude fraj bro, fraj for sure...