どこ行ってたの

where have you been?

→ どこ
phrase Rare #35,190
where have you been? A casual way to ask where someone has been; a contraction of どこに行っていたの.
JA: 昨日の夜、どこ行ってたの?
EN: Where were you last night?

おじさんどこ行ってたの?

Uncle, where have you been?

— Perfect Days (2023)

どこ行ってたの?

Where have you been?

— ミスティック・リバー (2003)

あなたどこ行ってたの!

Where have you been?!

— ハウルの動く城 (2004)

「どこ行ってたの?」「友だちを見送りに駅へ行ったんだ」

“Where were you?” “I went to the station to see my friend off.”

私に黙ってどこ行ってたの?

Where did you go without telling me?