noun
doxxer; person who digs up private info online
Derogatory internet slang for someone who researches and exposes another person's real name, address, workplace, etc., often with malicious intent. 特定 refers to identifying personal details, and 厨 is a pejorative suffix for an obsessive person.
あの特定厨が配信者の住所を晒したらしい。
Apparently that doxxer leaked the streamer's address.
SNSで不用意に写真を上げると特定厨に狙われることがある。
If you carelessly post photos on social media, doxxers may target you.
noun
person who identifies real-life locations from fiction
Derogatory internet slang for someone who obsessively pinpoints real-world locations or items that appear in anime, games, etc., often spoiling the immersion for others. The same 特定＋厨 pattern applies.
アニメの背景から舞台となった実在の場所を探し当てる特定厨がいる。
There are people who obsessively identify the real-life locations used as settings from anime backgrounds.
特定厨のせいで聖地巡礼が荒らされることもある。
Sometimes anime pilgrimages are disrupted because of these location-identifying fanatics.
厨 is a slang suffix derived from 厨房 (kitchen) via 中坊 (middle schooler), used to insult someone acting immaturely or obsessively about a topic.
Compound of 特定 (tokutei, 'identification') and the derogatory slang suffix 厨 (chū), which originated from 中坊 (chūbō, 'middle schooler') and is used to insult obsessive or immature behavior online.