Squirting is when you insert about the second joint of your finger into the vagina and stimulate the G-spot (around the back of the clitoris) in a scraping motion from the back to the front, causing a squirt of liquid that is different from pee (there are various theories). There are two types of squirting: one where stimulation with a vibrator causes a lot of squirting, and one where the G-spot is stimulated with the head of a penis and causes squirting.