<http://www.urbandictionary.com/define.php?term=COYB>

Seems a strange choice to me...

They're not the Blues! They're the the Toffees! We're the Blues! Blue shirt, blue shorts, and occasionally, blue socks!

But I get that you're joking around ;)

I'm less joking than you might think. ;)

It's really nothing to do with Chelsea, in any way. Its never been a chant, it's never been a song, it's never even been a cheer, for Chelsea fans. Whereas Everton fans DO sing "Come On You Bluuuues", and have done for generations.

Just like "Come On You Spurs" has been sung for generations, thus: COYS.

Chelsea fans using it (and Gooners with COYG attempts, too) are really just ripping it off. It's a little obnoxious, really.

Why not just stick to your own, like KTBFFH?