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1.
An individual that goes WAY beyond simply being a fan. This individual would rather dress up in their team colors, ignore the hot babe they are with and yell at the tv about the stupidity of the refs/coaches/players every call. They feel each play should have resulted in a touchdown and honestly can't believe it didn't. These individuals are often found sitting next to you at the bar and force you to root against their team, even if it is your team also.
Sports Douche: "Why the hell did the running back run up the middle??? Couldn't he see the hole clog up before he got to it? They should have called a pass on the play! It would have been an easy 6!!"

Girlfriend (thinking to herself): Why am I with this Sports Douche? He can't even see I'm not wearing a bra! Doesn't surprise me, he couldn't even see that both receivers were double covered with the safety over the top. Clearly they had to run the ball and the defense was just that good on that play. Idiot... Hmm, who's that guy over there...???
by Beech_nuts September 16, 2009
 
2.
A person who's a fan of the New York Yankees, Los Angeles Lakers and Dallas Cowboys. Only watches their teams when they're in the playoffs. When their team wins, they're obnoxious. When their team loses, they don't care. So, smack talking with them is never fun. They can never hold up an argument about sports. Most of the time, they don't even know any of their team's players except for their best player.

Jack Nicholson: Ultimate Sports Douche; Yankees and Lakers season ticket holder.
Look at that sports douche at the end of the bar. Rooting for the Lakers when they score but doesn't understand what's even going on in the game. He's wearing a Yankees hat and a Cowboys sweatshirt. Wait... is that Jack Nicholson?
by Loyal_Fan October 31, 2010