noun
Refers to a person or thing that becomes the object of ridicule or laughter.
彼は失敗して、みんなの笑い種になった。
He failed and became everyone's laughingstock.
物笑い also means 'laughingstock' but is less common and slightly more literary.
Compound of 笑い (warai, 'laughter') and 種 (gusa, 'seed' or 'source'), literally 'source of laughter'.