BD

An even shorter way of abbreviating "birthday" than "b-day."

BD is an acronym that stands for "Big deal." It is typically used to emphasize the importance of something, such as an issue or an event.

The acronym is often seen where character space is a premium, like in emails, in text messages, or online on social media. If it's a really big deal, a person may use the BFD acronym. Or if it's not that big of a deal, the NBD or INBD acronyms may be used.

Or, "backdooring;" a League of Legends term that refers to a strategy in which players use their champions to attack turrets or the enemy's Nexus without pushing a corresponding lane first; to employ this strategy, players generally need an element of surprise and some sneaky tactics.

The official abbreviation for Blu-ray; may refer to a Blu-ray disc or player.