Vag Sap
The vaginal wetness and moisture that does not appear to be present until an object, finger, penis or other body part is stuck inside the vagina. After which, like a tap for tree sap, allows the wetness to flow out freely thus creating Vag Sap.
Hey dude. I hear your girlfriend has a dry snatch. No way braaa. It may seem that way but once you get a finger in there, nothing but pure Vag Sap. Sweet!