It simply means "hell naw", but it really means "no."
It's used to describe surprise and opposition towards a comment and/or situation. usually in a major way
WOMAN: I need a huge favor.
MAN: What.
WOMAN: Will you pay my rent and bills? I'll give you something to make it worth your while.
MAN: HELL TO THE NAW!!!!!!!! You just gonna use me, then set me up.
Hell naw, to the naw naw naw *Heeeellll to the naw*!
By Shanda
Aww Hell Naw
when saying this phrase..say it in a high pitched pissed off tone.. it means something along the lines of "ooh no you didnt" or "bitch please, what in the hell were you thinking"... also can be used as a form of disbelief in a situation
"aww hell naw you did not just cross me like you know me...step back bitch or my homies gon woop yo ass"