Whrongklydiddlydociouslybonkusklonkus

Pronunciation: Wrongk-lee-donk-lee-did-lee-doshious-bonkus-klonkus
Means to be incredibly stupid whilst just being incorrect so example:

Guy 1: "That guy was Whrongklydiddlydociouslybonkusklonkus"

Guy 2: "I know right?