boro-boro
Primarily describes something worn out, tattered, and falling to pieces (ぼろぼろの服). Also used for tears falling freely (涙がぼろぼろ). The physical deterioration meaning is far more common.
💡Watching a sad movie ending — 'I was crying boro-boro by the last scene.'
感動してぼろぼろ泣いた。
I cried boro-boro, deeply moved.
She cried ___ after reading the farewell letter.
お別れの手紙を読んで○○泣いた。