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1.
The brightest Star of the universe. The hottest baloon. The source of energy.

As per Indian astrology it represents Sun.
Diwakar (Surya), (Sun)
by AUM April 11, 2006
 
2.
1. A person that is extremely angry and irritable.
2. General slander for anyone of Indian decent.
1. Man, Joe must've woke up on the wrong side of the bed this morning because he is being such a total diwakar today!

2. Pajul took my last beer! That stupid diwakar.
by Justin July 14, 2004