Here's how it's used:
* "The ending of the movie was a little on the nose. I saw it coming a mile away."
* "His jokes were a little on the nose. They felt forced and not very funny."
* "The symbolism in the painting was a little on the nose. It felt like the artist was trying too hard to make a point."
The phrase is derived from the idea of something being "right under your nose," meaning it's obvious and easy to see. So, "a little on the nose" suggests that something is a bit too obvious or too obvious for its own good.
It's important to note that the expression is often used in a slightly negative or critical way, implying that something is lacking in subtlety or originality. However, it's not always a harsh criticism and can simply be a way to describe something that's a bit predictable or straightforward.