an abbreviation for the abbreviation of "by the way". Saying "bee tee double you" just sounds lame. Therefore, this was an absolutely necessary addendum to the dictionary of abbreviations.
Bt dubs, if you guys are ready to go get something to eat, i'll go. I'm not going to be pushy or anything, but i'm ready.
邮件由 email@example.com 发出。我们决不会发送垃圾邮件。