it stands for Awkward Texting buddy.
It's someone you text when you're caught in a very awkward situation, or when you're waiting for someone somewhere. Simply text the letters' atb' to your awkward texting buddy, and pray to god they know what it stands for.
Lauren: atb
Julia: What does that stand for?
Lauren: Awkward texting buddy, I'm in an awkward situation. Please text back.
Julia: Oh, okay! No problem.
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