でたらめ
でたらめ · detarame · JLPT N2 · noun
utterance
出 (come out) + 鱈目 (ateji for cod eyes, chosen for sound) = words that come out random
The 鱈目 part is ateji, so the kanji were picked for their sound, not their meaning. The cod-eye link is folk etymology. Nonsense spills out of you at random.