A sexual action, in which one involved has a pollen allergy, places pollen in and around a vagina. They then stick their nose in the vagina, until their nose runs and they start to sneeze, filling the vagina with nasal mucus. They then precede to shove the mucus as far down the vagina as possible, using a fist or a penis. The snot is then used as a lubricant.
"Babe, why are you sneezing in my pussy?"
"Don't worry, love. It's a trick I learned called a Mogie-bogie."
Or
"What u saying gal, u tryna get this mogie bogie or wot?"