Words are packets of data that carry meaning that's agreed upon by the users of the language. So when I say "there cannot possibly be any objective meaning of life," it's a statement regarding the agreed-upon meanings of the words being used. In this case, the words in question would be "meaning" and "life." Ergo, the statement was one of objective fact, not subjective opinion.

The heart has an objectively observable function (pumping blood) but not a meaning.

Strictly speaking, I'd have to argue against morality itself being objective. To some cultures, the accumulation of power and the spreading of their genes are regarded as the highest good and ideas like the NAP would be disgusting to them. However, once we establish a common underlying moral principle, we can treat everything that follows objectively because of the agreed-upon meaning of the words used. In other words, once we establish a foundational principle like "using the property of others without their consent is bad," we can tie everything else logically back to this. This is why we should be highly suspicious of anyone that says "that's just semantics." Semantics are actually a super big deal because it's how we logically trace things back to our foundational principles and it's how we can spot logical inconsistencies and fallacies. It's how a subjective concept like morality can be explored, developed, and managed in an objective manner.

I hope this is making sense. I'd totally be down for a live chat sometime to hash it out over more bandwidth.