Phrase lifted from some song. It is now an allusion to the futility of trying to claim copyright on generic, pointless ideas, particularly within internet fandoms. Has something to do with purple dogs, swans with dogs shoved up their asses, and deviantart.com. Maybe. We can't say for sure.
"Holy shit I came up with bat-winged transvestite raver Anubis stop drawing him"
"You can't fight the moonlight, baby."
"You can't fight the moonlight, baby."
by tengu shoes November 8, 2004