They all secrete saliva -- the parotid through tubes called salivary ducts near the upper teeth, the submandibular under the tongue, and the sublingual through ducts on the floor of the mouth.

The main salivary glands (parotid glands) are located over your main chewing muscle (masseter muscle), beneath your tongue (sublingual gland), and on the floor of your mouth (sub mandibular gland).

Gleeking is when you voluntarily or accidentally expel saliva from the sublingual glands under your tongue while your mouth is open, spraying spit out of your mouth like squirting a water gun.