I recently found an article in Polish about the difference and it goes like this:
Dadaism - avant-garde art movement full of intended nonsense
Dudeism - things we are discussing here, based on TBL
Dudaism - supporting Andrzej Duda, the current president of Poland, especially in a total 'yes, sir' manner.
Just in case some Polish dudes were struggling with English language here. Do not confuse :)