Modern slang often used in 2 ways.
Nah: meaning “No fucking way” or “bullshit”
Or
Nah: meaning “No way” or simply “no” in a casual peaceful way.
1: “Bro you really just do shit like that?”
2: *silence*
3: “tsk, Nah….”
nah is like no but the word is spelled like "na"
billy: hey lets play my newest ps6
andrew: nah that's a fake ps6
billy: bye i gtg
andrew: nah man be here
billy: nah i have to eat
nah is a different way to say yes
"can I come with you?"
"nah"
"ok, im comming then"
Nah is the sarcastic way of saying no but is used differently for example:
person 1:Hey dude is this the stop.
person 2: Nah you don't say.
in this context it is used to as a way to say no you don't say it is used in that way so that the person who has received that comment realises that they are on the correct stop