Islamic Interpretation of Dreams (Ibn-i Sirin):

Saliva or spittle in a dream represents the element of one’s strength.

If in a dream one seems to have a dry mouth, it represent his inability to do what his competition can do.

Spitting against a wall in a dream means spending one’s money in a good cause, or engaging in a profitable business.

Spitting on the floor in a dream means purchasing land.

Spitting against a tree in a dream means to recant one’s promise.

Spitting at another person in a dream means despising him. Warm saliva in a dream means long life, while cold saliva represents a short life.

The color of one’s saliva in a dream shows the state of one’s spirit.

Spiting blood or phlegm in a dream means speaking ill of others.