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2.
So impressive and dominant that fear is struck into the hearts of all who oppose.
1. Zdeno Chara

2. The Boston Bruins are scary good
by BigZ33 January 06, 2012
 
1.
The feeling when; an idea, ability, level of happiness, creation, work of art becomes so good that fears (of failure, success, 'losing it', fame, destruction of the creation and others) manifest themselves. The next steps can include the destruction of the goodness itself, or continued elevation to awesomeness.
Zuckerberg: ooh, just had a scary good idea for a website...
by enjoy this feeling April 24, 2014