noun
laughable absurdity; ridiculous thing
Describes something so absurd or preposterous that it makes one burst out laughing. Often used in the phrase 噴飯ものだ.
彼の言い訳はまったく噴飯ものだった。
His excuse was utterly ridiculous.
あの映画のストーリーは噴飯ものだ。
The plot of that movie is laughably absurd.
noun
extremely irritating thing
Less common nuance; refers to something so absurd or unreasonable that it provokes irritation rather than laughter. Context usually makes the emotional tone clear.
その決定は噴飯もので、怒りを感じた。
That decision was extremely irritating and made me angry.
From 噴飯 (ふんぱん, 'bursting out laughing', literally 'spouting rice') + もの ('thing'). The image is of something so ridiculous that one cannot help but laugh out loud, possibly spitting out food.