Green Day frontman Billie Joe Armstrong went viral, so to speak, when he posted a photo of South Korean pop sensation Psy to his Instagram feed, accompanied by the caption, "This dude is the herpes of music. Once you think it's gone, it comes back. #herpes #flareup #pleasegoaway"
The "Gangnam Style" singer was informed of the putdown on a recent sitdown on Fuse.
After being explained what herpes is, Psy considered for a moment and replied, "I think it's cool."
He then thanked Armstrong directly for the metaphor.