"I Heart Poppy" is about Poppy's new relationship with a boy. She sings about how she has only dated bad boys in the past and that they could never please her, yet they keep coming back for more attention. However, the subject of the song is nothing like her previous lovers, pleasing Poppy and always showing his love to her.
- August 9th, 2018 - A 17-second snippet was leaked on SoundCloud by the user guppyfeels.
- September 17th, 2018 - A 13-second snippet was leaked on YouTube by the user That Poppy Archive.
- September 20th, 2018 - The full song was leaked on SoundCloud by the user Colorful Poppy.
- The song's existence was confirmed by Hauntedbymel.
- The leaker also confirmed the existence of "Rocket Science".
- The male background vocals singing "I love you, Poppy" were sung by Chris Greatti.
- The original filename of the song is "I Heart Poppy_LEGRuff_041215".
- The leaked version is most likely a demo due to the original .mp3 file having "ruff" in the title, which is likely an abbreviation for "rough demo".