Learn the Traditions
Any true football fan will know their team's traditions and participate in them enthusiastically. Almost every high school and college team, as well as some professional teams, has a fight song played during timeouts or after touchdowns and other big plays. Learn the words to this song, as well as any choreography that goes with it. If you're cheering for a school you attended, learn the alma mater as well.
Supporting your team involves more than just singing; fans often participate in cheers or other spectacles during football games. Nowhere are these traditions more effective than at college stadiums, where tens of thousands of fans may yell and move in unison in an effort to get their team fired up. A great example of such a custom is the "Hog Call" at the University of Arkansas. At kickoffs and other key times during the game, Razorback fans flood the field with a deafening "Woooooooo. Pig. Sooie!" At University of Wisconsin games, tens of thousands of Badger fans shake the stadium with their bouncing as the loud speakers blast House of Pain's "Jump Around." Traditions like these may seem silly, but you can't be self-conscious when the game is on the line!