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1.
a statement used to refer to something being rad or extremely awesome.
Juno is a pretty radacious movie. It's totally boss.
by duchessxxlizz April 27, 2008
 
2.
Totally awesome/radical, a youtuber, a combination of everything awesome, completely mind-boggling
Man! That was Radacious!
Hey what's up guys? This is RADAC10US from RADAC10USGaming!
Look at that radacious guy!
That video game is totally radacious!
by RADAC10US June 24, 2013