Jefferson Starships, named by Dean Winchester, were new monster hybrids created by Eve as a test subject to see if she could create the ultimate supernatural predator. They were a combination of many of the monsters Sam and Dean have faced. They had the teeth of vampires and the spike of a wraith. They could also shapeshift into whomever they want.
When a relationship has ascended beyond regular friendship, but has not evolved into a 'boyfriend-girlfriend' dating scenario. A term that can be used in place of more than friends. Not to be confused withjefferson starship
Sam: So, Craig. You and Vanessa dating now then?
Craig: Nah man, don't think so. We only been out once.
Chris: Wait, if you two aren't dating, what the hell are you?
Sam: You two must be Jeferson Starships then.