ATB
ATB definition by Slang.net - The Slang Dictionary
This page explains what the acronym "ATB" means. The definition, example, and related terms listed above have been manually compiled and written by the Slang.net team.
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Someone who ends a message with ATB is wishing you "all the best." This acronym is a more succinct way of saying "I wish you well" or "regards."
If you'd like to reply in kind to an ATB message, you can end your response with cheers, wbw, or rgds - all of which also convey well wishes.