Negate

[Presentjackson]

I you {negate} or {cancel} a spell that an opponent cast targeting an heroic creature ability, would that creatures trigger still activate?   

[Presentjackson]

So that whole acher metaphor goes for pretty much anything on the stack? 

[Lyriczulu]

So that whole acher metaphor goes for pretty much anything on the stack?

More or less, yes.
Heroic is a trigger that happens when a spell is cast that targets a creature with the ability, so regardless of whether or not the actual spell resolves, heroic has already been triggered.

[Presentjackson]

Thanks for the clarifying circumstances