What does it mean if a girl is packing?

The phrase if a girl is packing in slang can have several meanings depending on context, some of which are crude or related to weapons, so interpretation requires care. Most commonly, similar to male version, packing can mean carrying a firearm or weapon concealed, so she is packing means she has a gun on her. In crude sexual slang, packing can refer to being well-endowed or wearing prosthetic, and when applied to a woman, it may be used in transgender or drag context to refer to packing with prosthetic, or in vulgar slang referring to anatomy. In other contexts, she is packing could simply mean she is packing luggage for trip, or that she is physically strong or muscular. In drug culture, packing could mean carrying drugs. Because the phrase often implies weapons, it can sound threatening if misinterpreted. In everyday neutral conversation, if someone says a girl is packing for college, it just means preparing belongings. As standalone slang, you need to consider conversation topic to understand whether it refers to weapons, sexual innuendo, or literal packing.