HBBD
HBBD definition by Slang.net
This page explains what the acronym "HBBD" means. The definition, example, and related terms listed above have been written and compiled by the Slang.net team.
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HBBD is an acronym similar to HBD, that means "happy belated birthday." It is used to wish somebody a happy birthday after it has already taken place.
HBBD is used by people who subscribe to the "better late than never" adage. They may have forgotten the person's birthday, gotten distracted with other tasks, or did not have a chance to send a birthday message. So instead of saying nothing, they send HBBD.