also: どろぼうネコ
noun
thieving cat
Literal meaning: a cat that steals food. Often used when a cat sneaks into a house or kitchen to take food.
うちの庭に泥棒猫が入ってきて、干物を食べられた。
A thieving cat came into our garden and ate the dried fish.
noun
homewrecker; adulterer
Derogatory term for a person (usually a woman) who steals someone else's spouse or lover. The image is of a cat sneaking in to steal.
彼女は友達の彼氏を奪った泥棒猫だと言われている。
She's called a homewrecker for stealing her friend's boyfriend.