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1.
The new slang for vaginal secretion.
Kevin: Dude what happened?

Jimmy: I was going down on her and her muffin juice got all over my shirt!
by Vanilla Weis June 01, 2009
 
2.
The ultimate hybrid of Muffins and Orange Juice.
one day the muffin man was taking a poop and he came upon MUFFIN JUICE.
by M u ff in Ju ic e March 22, 2003