I had to look it up, too. I would’ve guessed “down with the North,” as said by a Southerner - but I would’ve been way wrong (and I knew Whitney Houston wouldn’t have been saying that, anyway!).
Here’s the Urban Dictionary entry:
” ... hell to the naw
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.
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. ...”
In other words, Ebonics?