What does'Notice me Senpai' mean?

Is it a meme/quote from a movie? Seem to see the phrase in lots of places

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Its a meme/joke that originated from japanese animated shows (anime), basically a common theme in the high school anime genre is that a junior student has a crush on an upperclassman (senpai) and is always trying to get their attention. Soooo it kind of morphed into a 'joke' (which can honestly get annoying lol) and people just say it anytime they want someone's attention.