What’s this? What’s this?

There’s dickgirls everywhere

What’s this?

There’s strange tags over there

What’s this?

I can’t believe my eyes, I must be dreaming

Wake up, Jack, this isn’t fair

What’s this?

What’s this? What’s this?

There’s something very wrong

What’s this?

There’s furries eating dongs

What’s this?

The streets are lined with naked Disney princesses

Everybody seems so happy

Have I possibly gone daffy? What is this?

What’s this?

The lyrical reply is better, but for a straight answer, Wikipedia says:

“e621 is a furry-themed booru-style imageboard and art archive website launched on February 10, 2007. It is primarily known for hosting pornographic furry content.”