https://productforums.google.com/forum/#!topic/gmail/4q3AYMi... and https://facepunch.com/showthread.php?t=1423764 refer to this link.
Edit to add: https://haveibeenpwned.com/PwnedWebsites#BTSec
I only use "password" in random websites that force me to register (but that I'll never visit again).
I didn't feel completely comfortable posting the link but thought it was better that it's out there (and it looks like it's not even new according to comments).
Subject: Yours is one of 4,788,657 email addresses found in a paste titled "pred.me"
At the time, it showed up on the "Latest Pastes" on HIBP, but I think it's aged out now.