"Ok, here's how the scene goes John. You come into the room, and Kristie's character is intimidated by your presence. You force her to the ground, unzip your pants, and sort of, start to btw from then on, to exercise your power over her."
A shortened version of "by the way", also used for "between". Can be placed pretty muchanywhere in text messages.
_Why do you like this couple?
_There's so much alchemy btw them!
///
_I'm at your place, and I can't find the salt.
_It's btw the pepper and the sugar.