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2.
When something or someone is 'crazy cool'.

As coined by my 6-year old, Emma.
Did you see that helicopter land in the school field? It was 'crool'!
by Daddy Richardson January 17, 2012
 
1.
Combination of the words "cool" and "cruel".

Being cruel to someone to act cool in front of friends.
"Aw man...that was so crool!"
by Sarsion August 30, 2009
 
3.
the words cool and great are put together
prep1: THat movie was so cool
prep2: THat movie was great
prep3: That movie was crool
by Courtney Bernash July 09, 2005