Synonymous with the commonly used phrase, "What's up"? Used by one who is looking to find an agenda of recent events.
The phrase "What's
crack-a-lackin'?" originated in ghettos, and was used by thugs and gangsters to find out the news about any recent crimes committed in the area ('
crack-a-lack' is derived from sound a
gun makes when fired).
Guy 1: "Ay yo Tito, what's
crack-a-lackin'?"
Guy 2: "Nothin my
nig, but I heard that JoJo got whacked last
night at da club."
Guy 1: "Fo real yo? I heard they was poppin' off, but I ain't know JoJo was whilin like that!"