BL
BL has 2 meanings
Buddy list
Example
How many ppl do you currently have saved in your BL?
BL definition by Slang.net
This page explains what the acronym "BL" means. The various definitions, examples, and related terms listed above have been written and compiled by the Slang.net team.
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BL is an acronym for buddy list, which is the list of friends stored in someone's instant messaging program, such as AIM. The list is usually contained in a small window and lists your total number of buddies and which ones are online and available to chat.
The BL acronym was more commonly used when AIM was at the height of its popularity back in the 2000s when teenagers used the IM for communicating with friends. However, as smartphones became more common for communicating with friends the IM and the BL acronym have decreased significantly in popularity.