Ezekiel Dean's poem is a quiet love poem about picturing someone's smile and laugh. In the first stanza, the speaker is so caught up in imagining them that he almost forgets to breathe, and all he can do is smile in return. It's a small, sweet picture of being overwhelmed by affection.
The middle of the poem turns more thoughtful. Smiles and laughs, the speaker says, are "unique as a snowflake" yet "as common as glass." Everyone has them, and each one is still different. That idea leads to a more vulnerable worry: he can't stand to think that people are each alone. The final stanza is the most telling. Even if she's "unique-er than some," what matters is that she'll always be "the girl that I loved." The past tense suggests the relationship is over, or at least that this is a memory. The mood is tender, playful in its made-up word, and gently wistful.