look up any word, like donkey punch:
 
1.
Im good, its ok, NO
You wanna go fuck them hoes..."Nah man im good i got my girl"
by Shawtie April 22, 2003
 
2.
a negative; used to express refusal or denial or disagreement.
Dude: "Is today your birthday?"
Guy: "Nahman!"
by k3ll0 April 19, 2009