I know a nigga dirty and got the hammer

from Danny Brown – Monopoly Lyrics on Rap Genius

Meaning

Danny knows that his “friends” in the drug industry will rat him out, or more generally, that there are men waiting who wouldn’t hesitate to murk him. In gun lingo, “the hammer is the mechanism that strikes the firing pin, which ignites the primer charge and the propellant and sends the bullet downrange.” Basically what you cock back before busting a cap.

http://www.google.com/url?source=imglanding&ct=img&q=http://i24.photobucket.com/albums/c17/nontypnito/hammer3.jpg&sa=X&ei=DYAVUI_aEYq9rQHNloG4BQ&ved=0CAoQ8wc4Fw&usg=AFQjCNFfHYkMPKAtb7fmQ0RAFKU4xiViTg

Danny doesn’t really care, though, because…

Also a possible play on words with “thirty” (bars).

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