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1.
verb

To be living the good life; to be in a power of authority over others.
Automessage: Out.. BOSSIN. Leff msg.
by Kanda June 02, 2007
 
2.
Synonym for cool, awesome, or sweet.
Dude, that was bossin.

Whatever it was, it was bossin.
by CalebF May 14, 2008
 
3.
Something that is awsome or cool.
It is similiar to the word sick or ill. It is also better than Cron.
That trick was bossin
by G mac March 08, 2005