The point of Avada Kadavera is that muggles were so used to being killed out of hand by wizards that they associated the death curse with what would become the standard generic magic phrase.

Anyways, intent clearly matters for the spell more than the exact words or accents (directly canonically confirmed btw, not just implied by the books), which is why wizards can master casting spells without using words at all and they don’t all have to pronounce spells the exact same way. This also implies that Abra Kadabra might well be simply how that spell is pronounced in different regions, since we also know that there’s not some ancient magic speech/true speech going on, wizards can both create new spells and the foreign wizards use different linguistic conceits for their spells

This all clearly means Harry Potter wanted to murder Ron and not that it’s a silly comic making a silly joke.