To be a conscientious individual; always vigilant
Yo bruh, no lacking.
to walk around without a weapon (most often used in gang-related settings)
Dylan: "Yo, Jamar got shot by the thrift store last night."
Naseem: "I done told that boy to bring some heat wit' him. That's what happens when you lack 'round here."
Word you say when you agree with something
Thomas: “His dick is bigger than my arm!”
Dan: “Lack”
(verb) the act of drinking too much/doing too many drugs and acting a fool
Ex.1 "Look at buddy lacking over there"
Ex.2 "Better not lack too hard, you got school tomorrow"
Lack means that there is less of the thing you are referring to.
I got lack of sleep today so I am really tired