pedophile (slang, referring to the case of a Hong Kong child abductor who lured girls with the prospect of seeing "goldfish" in his apartment)
Definitions (粵典–words.hk)
名詞
以「睇金魚」為名，誘拐、非禮細路女嘅男人；亦都指有孌童傾向嘅人（量詞：個） men who abduct or harass young girls under the pretext of inviting them to 'see goldfish'; also refers to pedophilles