momentine wrote in spn_canon 😟bored

Listens: In the Evening - Led Zeppelin

Season 3 question

A Very Supernatural Christmas Spoiler, haven't seen, don't read :]

When they go and 'watch' santa and it goes: 

Santa's Elf: Welcome to Santa's Court. Can I escort your child to Santa?
Dean: Um, no. But actually, uh, my brother here, it's been a life long dream of his.
(Sam gives confused look)
Santa's Elf: I'm sorry, no kids over 12.
Sam: He's just kidding. We only came here to watch.
(Dean smirks and shakes his head)
Santa's Elf: Ewww.
(from TV.com) 

Why does she say 'eww'? I mean, what was it in Dean's head-shake that made her say it. I know it's a weird thing to say, but... myeh.
I'd appreciate some clarity- s'been bugging me since I watched it! :]