noun
complaining; griping; grumbling talk
Refers to talk that is full of complaints or grumbling; often used in contexts where someone is venting dissatisfaction.
彼の話はいつもこぼし話ばかりだ。
His talk is always nothing but complaining.
愚痴 is a more common word for complaints or grumbling, while こぼし話 is less frequent and emphasizes the talk itself.
Compound of こぼし (stem of こぼす 'to spill, to complain') + 話 (はなし 'talk, story').