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Something that is a mixture of radical, cool, and tubular. It usually means that something is perfectly amazing in every way possible because of all the levels of greatness that add up after each word.

It is slightly better than radicool because of the tubular added.
"Whoa dude! Thats radicoobular! The perfect mix of radical, cool, and tubular!"
"I know right?"
by pgoodpbad March 06, 2017
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