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1.
A slang term in reference to your homeboy; in some instances, it can be used in anger to refer to your homeboy in a negative way.
Used in normal conversation:

"Yo, what's up brosama?"

Used to refer to your homeboy in a negative way:

"Wtf dude, you blew up my GI Joe with a firecracker! What's up with that brosama?!"
by 'thew July 07, 2009
 
2.
a bro that is acting especially volatile and uppity for lack of attention
chill brosama. no one cares, quit fuckin talkin
by nicklesack May 27, 2008