Person 2: "Hey, man. What's up?"
Person 1: "Nothing, just gotta take a slam."
Person 2: "Oh, okay. Hey, your girlfriend called a minute ago, b t dub."
"I studied. BTdubs, I picked up your book."
It makes little sense, as the term itself has as many syllables as the phrase it's meant to abbreviate. Accordingly, it's degenerated into a cutesy term used mostly by girls. It has also been used in the gay community as a candid way of letting others know you are a bottom.
Bruce: Great, I'm a top. See you at my place at 9?
Rolls off the tongue like a bare-backed walrus. Enjoy.
Bt Dubs, N-Dubz run bathtubs.