peshanko
Describes something that has been flattened or crushed completely. Often used for hats, boxes, or deflated objects.
💡Sitting on a hat — 'Oh no, my hat is peshanko now!'
段ボール箱がぺしゃんこに潰れた。
The cardboard box got squashed peshanko flat.
I sat on the gift box and it went completely ___.
プレゼントの箱の上に座ってしまい、○○になった。