Okay, here's a good way to define dadaism. Think of any of Yoko Ono's work. That's Dadaism.
Some of the work being put up here on this thread is actually very, very good surrealism or abstract with outstanding design and color theory.
Dadaism, on the other hand, is absolute trash.
LOL, Yoko just lacks talent and isn't aware of the fact that people mock her for deficiencies. That isn't really Dada, its just sad. The original folks on the Dada movement were rejecting the art culture of the time. The pieces were a big middle finger to establishment, they weren't suppose to be "good".