Shaykh Shihaab-ud-Deen said: If there is a lot of mucus, it is indicative of worries especially if it contaminates his clothes. Spitting may be indicative of bad words.
Someone else said: Mucus is indicative of a child, because there is a story that the cat was created from the mucus of the lion when it sneezed!
And it was said: If a person dreams that he blows his nose, he will pay off his debts and be saved from every distress. If his wife blows her nose on him, she will have a boy or will wean a boy.
If she blows her nose in a man’s bed, that man will betray the dreamer with his wife.