please define "lackin" or "lacking" as an ebonics slang term

In African American Vernacular English (AAVE), or what some refer to as Ebonics, "lackin" or "lacking" typically refers to someone being unprepared, vulnerable, or caught off guard, often in situations that could have serious consequences. It's frequently used in contexts where someone should have been more cautious, alert, or ready but wasn't. For example, "He got caught lackin" might mean that someone was caught unprepared in a dangerous or risky situation.