Fuck me.
Right. White goo; Womans own lubrication. It is secreted on arousal to ensure that the vaginal lining isn't damaged. Often, when the female is extremely aroused, excess is produced, as seen in the picture. When women orgasm, excess is often pushed further down the vaginal canal, hence the phrase "I've just creamed myself" uttered by a woman. Lack of this is when a girl needs lube, or when they get older, post menopause hence "drying up." Thought even the lesbian in this thread may have known that.
In the post by Joop6177, the discharges mentioned are mucal immune responses to bacterial and fungal infections, something that women are very prone to. As it says, white and clear are normal mucus secretions, yellow are bad (think puss from in a spot).
Finally, the gif. That is female ejaculation. The secretary gland that exits via a duct just behind the clit has the ability under intense orgasms to expel a fluid under a large force. This is what you are seeing. It is not urine as it has very different constituents (PAP is one of the defining markers) and comes from a spongy tissue in front of the vaginal canal.
Any other dumb questions or excretions?