Every episode of the show is named after a famous song. "The End is the Beginning is the End" is a Grammy award winning song by the American alternative rock band The Smashing Pumpkins.
When Mrs Olsen reveals her decorated 'cookie', Bailey questions bedazzling her vagina, however, it's not the vagina that gets decorated (it would be uncomfortable and rather difficult to adhere jewels to a mucous membrane, similar to the inside of your mouth), but the vulva. Plenty of laypeople colloquially refer to the entire female genitalia as the vagina, but an experienced and very particular doctor like Bailey would use correct terms like labia and vulva.