Senpai means
Teacher or Mentor in
Japanese. The word is most commonly used by annoying as fuck weeaboos, making many people cringe when
said out loud]
Japanese School Student: "Good
morning Senpai"
Filthy Weeaboo Casual: "NOTICE ME SENPAI NOTICE MEEEE"
(Everyone within a hundred
foot radius begins to speed walk in the opposite direction)