Vocabulary What does 外泊 (がいはく) mean? 外泊 (がいはく) means staying out overnight (away from home, dorm). Quick factsReadingがいはくLevel (estimated, JLPT framework)N2 外泊がいはくN2 · estimated, JLPT frameworkstaying out overnight (away from home, dorm)Kanji in this word外outside泊staying overnight; anchoring