Quote from Barney in The Slutty Pumpkin
Barney: You know what I love about Halloween? It's the one night of the year chicks use to unleash their inner ho-bag. If a girl dresses up as she a witch, she's a slutty witch. If she's a cat, she's a slutty cat. If she's a nurse... Lily: Wow, we get it. Barney: She's a slutty nurse.