The act of getting so incredibly high, you are stupid as a nigga. Used as an adjective or a declaration.
Wizard 1: Dude rip the bong already
Wizard 2: I don't think I can dude, I'm nigga blown.
Pimp 1: Nigga pass that blunt, quit hogging it
Pimp 2: uhuhhhhhuhhfuhhgghghghg
Pimp 1: What's wrong with you dude?
Pimp 3: Man that niggas nigga blown.
Nigga: NIGGA BLOWN!!