Definition of words used on the shirts.

 COMPLICOSIS ( kǝm - 'plē - 'cō - sǝs ) noun 

  1. An obsession causing one to make things complicated.

    “This new math was created by someone totally sick with complicosis!”
  1. A mental disorder causing resistance to harmony.

    “Why is Hector constantly making so much noise? Is he mentally a victim of complicosis or something?”

SIMPOLOGY ( sim - 'pä - lǝ - jē ) noun
The study of keeping things simple.

"It seems to me that all nature practices simpology!"