Bad Moon is a song from the band’s fifth studio album, V. The song is filled with references to Lycanthropy and wolves.

In an article by Scene for Dummies, the song is described as an “airy and ominous” track that “explores a fascination with the occult and fucked up things people do at night.”
In an interview with Kerrang, J-Dog stated that his production and his idea in general behind this song was inspired by Creedence Clearwater Revival’s song Bad Moon Rising.

Source:

Bad Moon — Hollywood Undead Wiki

Bad Moon is a song from the band's fifth studio album, V. In an article by Scene for Dummies, the song is described as an "airy and ominous" track that "explores a fascination with the occult and fucked up things people do at night."