Dream meaning of skull
To dream of skulls grinning at you, is a sign of domestic quarrels and jars. Business will feel a shrinkage if you handle them.
To see a friend’s skull, denotes that you will receive injury from a friend because of your being preferred to him.
To see your own skull, denotes that you will be the servant of remorse.

Broadly speaking, it is an emblem of the mortality of man, as in the literary examples of Hamlet and Faust. However, like the snail’s shell, it is in truth ‘what survives’ of the living being once its body has been destroyed. It therefore comes to acquire significance as a receptacle for life and for thought, it is with this symbolic meaning that it figures in books on alchemy, where it is represented as the receptacle used in the processes of transmutation. A great many forms of superstition, ritual and—indeed—of cannibalism, are derived from this idea.
Danger and death are symbolized by the skull and crossbones, which is often found on labels that warn of poisonous contents. The skull and crossbones was also adopted by pirate ships and the Hell’s Angels. Each Halloween the skull – with or without the crossbones – is still used to warn of danger and death.
Carl Jung decided to become a psychologist after dreaming that he found a skull in the basement of his house. The skull represented his desire to discover and explain the secrets of the mind.
Dreaming of a skull also refers to mortality and to your spiritual contemplation about the beginning and the end of life. It can also express things that are coming to an end or whatever you are just unable not reach.
For gypsy people, skulls are the wisdom of their ancestors. Drinking from one of those means sharing this old knowledge. In Ireland it symbolizes the truth because it is said that if an individual takes false oath with a skull, she will die soon.