とっくのむかし
a long, long time ago; very long ago
Also written 疾っくの昔
Expression, Noun
「あれ？ここにパン屋やさんなかった？」「それなら、とっくの昔むかしに潰つぶれちゃったよ」「うそ、いつの間まに？」「半年はんとし前まえぐらいかな」
"Huh, didn't the bakery store use to be here?" "Oh, it went bankrupt a while ago." "Really? When did that happen?" "I think it was about half a year ago."