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Test-Driven Hyperactivity Disorder. A developer's inability to concentrate on the needed design (e.g., for a web application) because s/he's frantically hopping back and forth between testing and coding a minimal example. Often seen in Test-Driven Design and Behavior-Driven Design exercises.
In a frenzy of pair programming and TDHD, Alice and Bob have managed to reach a local maximum (i.e., sweet spot) in their web application's design. Unfortunately, the global maximum design is totally different and basically unreachable by any rational amount of refactoring...
by ClojureDoor September 19, 2013