A professional football team in the nfl located in seattle, Washington. This term is to refer how much this team lacks in the superbowl department. Seachickens refer to how the referees "cheated" them out of the superbowl against the pittsburgh steelers.
"man dude, you were being such a seachicken!" "it was the refs, they cheated us!" *usually seachicken's fans have annoying high pitched voices*