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1.
euphemism for "a gunfight".
"Now we can handle this like gentlemen or we can get into some gangsta shit..." -Snoop Dogg

If you really think about it, the Civil War was nothing more than some gangsta shit. A lot of gangsta shit.
by Nick D September 16, 2003
 
2.
This actually comes from the 1973 movie The Mack which cam way before Snoop Dogg. Same meaning though.

One of the most badass movie lines ever.
"Listen Mr. Pretty Tony, I mean you know the rules. I mean, your bitch chose me. Now we can settle this like you got some class, or we can get into some gangsta shit".
by Turkeyton July 10, 2008