BBN
BBN definition by Slang.net - The Slang Dictionary
This page explains what the acronym "BBN" means. The definition, example, and related terms listed above have been manually compiled and written by the Slang.net team.
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BBN (bye-bye now) is a quick, informal way to sign off at the end of a chat conversation. You may receive this acronym from friends or strangers, who will likely use BBN in different manners.
When a friend signs off with BBN, they likely plan to talk to you again. Thus, BBN means BB4N (with one less character and a bit more sass). When a stranger ends a conversation with BBN, they're probably tired of talking to you, and using BBN to abruptly tell you to GTFO.