I'm pretty sure this means Dean's queer?

The siren, who turns herself into whatever your most desired sexual partner is... for Dean, turned into a guy who digs his car and his music.

ETA: *continues to watch episode* Man, was that a fake-out? They do like to fuck with us, don't they.

ETA: ...double fake-out. OH MAN. YEAH, YEAH DEAN'S A LITTLE QUEER.

Update

I have now officially seen all of season 4 of Supernatural.

(Still remaining: two episodes of s1, about half of s5, and most of s2 and s3.)