"Black Fins" by Ricky Montgomery delves into themes of loss, nostalgia, and the search for closure. The song follows the story of someone reminiscing about a past relationship or friendship that has ended, using the metaphor of "black fins" to symbolize the memories and emotions associated with that person.

In the first verse, the mention of "black fins" waiting for the tide to come back suggests a longing for the return of what has been lost. The lyrics convey a sense of detachment, acknowledging that these memories are not the same as the person they once knew. The phrase "just another little piece of ocean trash" implies a diminished value or insignificance of these memories.

The chorus reflects the protagonist's conflicted emotions. They contemplate whether, if given the chance, the other person would disappoint them again, questioning whether they would abandon their responsibilities and obligations. The reference to "kicking out those kids again and again" hints at a history of neglect or abandonment in the relationship. The protagonist acknowledges their uncertainty about the other person's motivations and decisions, left to wonder why they chose to leave for Mexico.

In the second verse, the "black fins" take on new meaning, representing the person's renewed vigor and zest for life. However, the protagonist recognizes the falsehood in this newfound vibrance, recognizing the manic energy as insincere. They express a desire to mend the broken hearts left behind and move on from the presence of this ghostly figure.

The bridge introduces additional layers to the metaphor of "black fins." Scuba gear is mentioned as a metaphorical representation of exploration and self-discovery. The lyrics express a wish for a deeper understanding of the person and regret over missed opportunities for connection. The mention of Illinois and the mundane image of milk and Chips Ahoy cookies suggests a longing for simpler times and a bittersweet nostalgia for a lost connection.

The song concludes with a repetition of the chorus and outro, emphasizing the desire to let go of the lingering presence of this person, symbolized as the "little ghost" and "funny shadow." The protagonist acknowledges the need to release these memories and move forward in their own life.

Overall, "Black Fins" explores the complexity of past relationships, the longing for closure, and the struggle to let go of what once was. It delves into the uncertainty and nostalgia associated with lost connections while highlighting the importance of healing and self-discovery.