noun
Familiar, friendly term for a middle-aged man, often used by children or in casual speech. Can refer to one's own uncle or an unrelated older man.
隣のおっちゃんがいつも飴をくれる。
The middle-aged man next door always gives me candy.
おっちゃん、この辺に郵便局ある？
Hey mister, is there a post office around here?