hello stranger
US /həˈloʊ ˈstreɪn.dʒər/
UK /həˈloʊ ˈstreɪn.dʒər/

1.
久しぶり, やあ、見慣れない顔だね
a friendly greeting used when you meet someone you know but haven't seen for a long time
:
•
Oh, hello stranger! I haven't seen you in ages.
ああ、久しぶり!本当に久しぶりだね。
•
When she walked into the party, her old friend exclaimed, "Well, hello stranger!"
彼女がパーティーに入ると、旧友が「おや、久しぶり!」と叫んだ。