what does negative current mean?

Everything is quite arbitrary.
The normal convention (since the first days….) is to consider that the current passes from a voltage (potential) positive or higher to: a voltage (potential) null, negative or lower. In reality, it is itself a flow of electrons in the opposite direction.
In common usage, it simply means flow in the opposite direction to what was considered “positive” flow in the circuit at the start of theoretical evaluation. In circuit analysis, assumptions must be made at the beginning of the analysis. If the result gives a negative current, it means that the flow is in the opposite direction.

what does current mean

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AC stands for alternating current. The alternating current can fluctuate at any frequency (# times per second, usually expressed in Hertz, Hz) that you want. However, the energy entering your home fluctuates between 60 in the United States and 50 in Europe. It has to do with the development of electricity. They had to synchronize the phases when they created them, and they would do this by connecting the two sources to lamps that would flash at each spike. 50 or 60 times per second is approximately the maximum cycle rate visible to the human eye. The positive and negative currents indicate in which direction the electrons flow. Nothing will happen if you touch the positive or negative current, but don’t touch both at the same time.

It is called conventional current because scientists and engineers have agreed that current flows from positive to negative. Although it does not exist or is fictional, this fiction is still useful

negative current is not a real phenomenon, it’s just a tool we use to solve KVL equations if needed. current is defined as the flow of charge from a high potential to a lower potential, negative current would imply that current is flowing from a lower potential to a higher potential, which it really isn’t. I think because current is something that happens just by having two potentials connected to each other by a conductor, then you can’t reverse that natural process. Ben Franklin really screwed everyone up when he defined that as the flow of positive charge, but yeah, like the other guy mentioned, it’s the flow of electrons.

These are two directions in the circuit. One follows the current in the direction of the circuit, which is called positive current and the opposite directional current is called negative current.

It just means that the actual current is in the opposite direction to what you originally (ARBITRARILY) assumed when you constructed Kirchoff’s laws for solving currents in a circuit.