Nonverbal communication can play an important role in our interpretation of what another means by what one says (especially when one doesn't mean what they say), but I don't think nonverbal communication should alter our understanding of what a word actually means.

Whether a person has a gun in their hand is going to change our interpretation of their words. Whether a woman is taking her clothes off is going to change our interpretation of her words. Whether we are at someone's funeral or birthday party is going to change our interpretation of what is said about them.

Gallows humor is more impressive on the gallows.

Have you read Ludwig Wittgenstein's "The Blue and Brown Books?"