song slaps
the song is excellent
https://gyazo.com/2c66cd8d04bfd1eb53c42a7efa502f6e
from slap
the song slaps = the song is excellent
What Does That Slaps Mean? | Slang by Dictionary.com
Slap is slang verb meaning “to be excellent or amazing.” It’s especially used to refer to a song someone finds extremely good, as in This song slaps!
origin
StoriANXIA: It means you're slapping with the song i guess?