The song "Somebody That I Used To Know" by Dcoy Link (Ft. Gotye & That Hooligan Casanova) explores themes of betrayal, moving on, and self-discovery in relationships.

In the first verse, Dcoy Link emphasizes his attraction to rebellious, "bad" girls and highlights the fleeting nature of friendships. He expresses a sense of detachment from others, using metaphors like "life's a bitch" and "pulling a dagger out and stabbing it in the back" to convey his mistrust. He also discusses the superficiality of some relationships, particularly emphasizing the way money can impact their dynamics.

Following the hook, Casanova takes the second verse and reflects on a failed romantic relationship. He initially believed in and relied on the other person, but eventually realizes their incompatible nature. He likens their connection to a trip that could have been made easier but ultimately proves difficult. He mentions his own willingness to break promises and suggests the other person shared this same quality. Casanova acknowledges his own role in the demise of the relationship, describing himself as someone who enjoys playing games but admitting that he made her cry and caused pain.

Overall, the song delves into the complexities of human connections and the ways in which people can change and disappoint each other. It explores the aftermath of a once-close connection, highlighting the emotions of hurt, betrayal, and the need to move on. The lyrics express the artists' individual perspectives on past relationships and touch upon themes of self-preservation and personal growth.