“Only Girl” is a song about demanding respect from a man. In an interview with Genius, Uchis explained:

I wanted the song to be about the importance of understanding that not everyone deserves your time. People need to earn your trust and show you through actions what you mean to them.

The song’s hook is sung by The Internet’s Steve Lacy. In the same interview, Uchis explained why she wanted a guy to sing the hook:

I feel like the role reversal fits the concept of the song—the idea of women taking things into their own hands and being dominant enough to say no and set boundaries.