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俺だったら

if it were me

→ 俺
phrase Rare #36,708
if it were me 俺 is a very casual, masculine way to say “I.” だったら means “if it were,” so the phrase introduces what the speaker would do or think in the situation.
JA: 俺だったら、少し待つよ。
EN: If it were me, I’d wait a little.

俺だったら、彼の忠告に従うけどなあ。

If I were you, I'd take his advice.

昔の俺だったらミドは好きになっただろうか

Would the old me have fallen for Mido?

— オールド・ボーイ (2003)

俺だったら、トムの忠告に従うけどなあ。

If I were you, I’d follow Tom’s advice.

俺だったら、違う行動を取るけどな。

If it were me, I'd do things differently.