https://www.urbandictionary.com/define.php?term=nah+bitch&defid=8970305
What you say to someone when you agitated and they say something stupid.
Homie: Bruh let's go down to the club and get some booty for the nightYou: I ain't feelin it cuzHomie: Nigga You never feelin anything c'monYou: Nah bitch