carrying a gun, often concealed
The off-duty policeman was packing.
gerundive form, by ellipsis from "to pack heat"
The insertion of gauze or other material into a body cavity or wound for therapeutic purposes.
The material so used; a pack.
Armed, esp with a pistol; carrying: The policeman was packed before he raided the building (packed 1980s+ Teenagers, packing 1990s+)