Found this word here. https://gigazine.net/news/20110530_how_words_are_formed_in_the_brain/
I've looked it up and came up with "妄想" meaning "delusion" and "漏れ" meaning "leakage". I'm lost on what ダダ means here.
I tried looking for other examples and found this on twitter. https://twitter.com/storyer0519/status/949526914934349824