VIDEO: Psy Learns What Herpes Is, Thanks Billie Joe Armstrong For Comparing Him to It

The Green Day frontman took to Instagram to liken the South Korean pop sensation to a viral sore that "keeps coming back."

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.