Can easily be part of a song you hear many sing "vagina biscuit eat them while you can! Vagina biscuit catch them when you can!" In a light hearted chant. Vagina biscuit is commonly known as a term used in threesomes between two women and a man. It is when a women's vagina is penetrated by a penis and also by another women's tongue and finger creating a slippery bowl of vagina biscuit. Often you hear women discussing this the next day. " I had a great vagina biscuit last night with Will and Kate!". It is a bonding technique to create close tight knit friendship groups. Also slang word as a form of greeting " sup vagina biscuit"