The song "Sliden" by Yung Internet is about late night flirting and sliding into someone's direct messages (dm) on social media. The lyrics describe a scenario where it's late at night (10 minutes to half past 3), and the person is still awake and receiving messages from someone who is interested in them. The song talks about the chemistry between the two people and how they keep sliding into each other's messages, even when the person doesn't reply right away. The lyrics also mention that the person is not interested in swiping or paying attention to anyone else, indicating a strong attraction and connection with the person they are messaging. The use of the word "slide" refers to the action of sending a direct message on social media, and the song portrays a sense of late-night intimacy and excitement. Overall, the song "Sliden" captures the feeling of late-night flirtatious communication and the excitement of connecting with someone through social media, even in the late hours of the night.