Serena Gravey refers to an internet meme that circulated amongst the Sailor Moon fandom on the internet. On July 29, 1999, a user named Matthew Elias posted to alt.fan.sailor-moon a message with the topic, "How much gravey do Serena does she make?"
The text of the message was solely, "Can sombody answer the question above?"
The sheer absurdity and poor grammar of the question resulted in the meme that persisted for years amidst the fandom.
- Google groups archive (Google is missing the original message from its archives, but has the rest of the thread)