BAK
BAK definition by Slang.net
This page explains what the acronym "BAK" means. The definition, example, and related terms listed above have been written and compiled by the Slang.net team.
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Someone who sends you BAK has returned to their keyboard and is ready to chat (or do whatever else you were doing) again. You're most likely to receive this acronym from someone who has been AFK for a while.
When someone sends you BAK, it's polite to respond with WB. You may then want to ask the person what they were up to while they were AFK. Or, you may just want to resume whatever you were doing.