The sense of almost boyish enthusiasm that comes over middle aged men when pursuing a hobby that requires expensive stuff and leaves non-hobbyists scratching their heads to figure out why it's so damned important. (Derived from Roy Campanella's observation about baseball: "You got to have a lot of little boy in you to play this game.")
When Jerry began talking about model railroading, it was easy to see the Campanella Effect in action.
An tradition held at Iowa State University. In order to be considered a 'true' ISU student, a girl must be kissed underneath the Campanile at Midnight.
When playing the game of Call of Duty Modern Warfare 2, a Campapotomus is someone who sits in a corner with a hearbeat sensor and/or ranger or model shotguns, this is most annoyin during Search and Destroy when the only person left is a campapotomus and everyone who is dead is forced to watch him.
Jack, "Ugh i got killed by another campapotomus and I was one away from a stupid chopper gunner"
Justin, "I'm sick of these campapotomuses its like every time I turn a corner he's blasting me with his rangers He just doesn't move.