nb is an abbreviation for "nose breathe".
Nose breathes commonly occur when you find something funny. Rather than laughing out loud, one exhales or breathe though your nose.
Example One:
Glenda: "most the time when I say lol I don't even lol."
Hilda: *nb* "niether do I just nb."
Example Two:
*Rudy's phone rings*
Hilda: *nb*
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