There are two main types of spitting: Spitting saliva and spitting phlegm. Leaving aside specific medical conditions, there's no physical reason why most of us need to spit saliva:

Spitting is the act of forcibly ejecting saliva, sputum, nasal mucus and/or other substances from the mouth. The act is often done to get rid of unwanted or foul-tasting substances in the mouth, or to get Ò€¦ Sunday, spitting out an ash cloud that rose to 20,000 feet. He has become famous for spitting out food onscreen. The computer was spitting out train schedules to the moon; He couldn't make sense of it.

The computer was spitting out train schedules to the moon; He couldn't make sense of it.