Being in Minnesota, I'll admit I'm a homer for pretty much any of the local teams.
Hockey and specifically the MN WILD are definitely my sport/team. My wife and I have split season tickets with a couple friends for a number of years now, and a hockey game every couple weeks is a great way to get through our winters which seems to drag on forever. I'm sure many intermissions will be spent scrolling through the phone looking at slingshot pictures this year.
On the Motorsports side of things, I'm also a fan of MOTO GP motorcycle racing (no TV broadcast this year so it's been tougher to follow) I've been to all three tracks they've raced in the USA over the last few years. Laguna Seca, Indy and COTA in Austin.
Who do you cheer for? Cheer against?