BBD stands for Best Before Date. This is a date indicating how long a properly stored unopened keg will keep its freshness, taste, and other qualities. All Beerwulf kegs are sent out with at least 4 weeks remaining (at time of purchase) before the BBD is reached.
The BBD can be found on either the neck or the side of a keg, depending on the type.
PLEASE BE AWARE: If you purchase sale price stock (which is discounted) you need to carefully check the BBD which is specified. There is a warning when you purchase sale price stock informing you of the shortened BBD, as in the photo below.