(Noun)
Stands for ¨Back-In-The-Day-
Booty*¨; Used to describe that nostalgic feeling when you reminisce the days that you used to hit dat ass back in the day.
*can substitute in other options based on
the situation or
context
Person
1) Hey did you see dat girls
ass?????
Person 2) Yeah we used to date for a while
Person
1) Did you hit that?
Person 2) Yeah. I remember that B.I.T.D.B. real well.