A colloquial suffix (‑kko) attached to nouns to indicate a person characterized by or fond of something, often a native or typical person from a place (e.g. Edo‑kko, inaka‑kko).
彼は生まれも育ちも江戸っ子で、下町の習慣に詳しい。
He was born and raised an Edo‑kko and knows the customs of the old downtown area well.
あの子は田舎っ子だから、自然の中で遊ぶのが得意だ。
That child is a countryside kid (inaka‑kko), so he’s good at playing in nature.
町っ子の彼女は流行に敏感で、新しい店をよく知っている。
As a town girl (machi‑kko), she’s sensitive to trends and often knows about new shops.