2 (a) Excessive and mindless enthusiasm for an activity which is often trivial or pointless. This concept was coined by a group of students from
radnor high school when they were bored during gym class. When you’re playing soccer, Intensity is the voice in your head that tells you to tackle the goalie. Intensity is the Mortal Kombat theme song playing on the nearest boom box when everyone in your gym class has a hockey stick. At the same time, Intensity is getting pumped over something irrelevant. You would be a normal fan if you got insanely pumped for a footbal game, but you would be Intense if you got insanely pumped for a football game between a mediocre team and a really shitty team (see Lower Merion High School and radnor). Other legit examples are shouting "defense" as other physics olympics teams try to get their rubber-band powered airplanes off the ground, getting in a fight with another school's mascot, and spirited douche-baggery.
Intensity is generally accepted to be equal to perspiration multiplied by duration. With this meaning, NEVER use the original pronunciation. A good bet is In-tense-it-eye.
2 (b) Getting rowdy