All of the above. I was born in the Fort and grew up rooting for the Big Orange in Knoxville, since my dad was an alumnus. Most of my mom's family (but not my mom herself) graduated from there. I have two degrees from UTK myself now; that's where I met my wife. My sister went there, a bunch of my friends went there, etc.
I don't even really call myself a "Tennessee fan." It's way too personal for that.