nightcore

The practice of making any given song sound more Japanese by raising its speed and pitch.

"Dude, someone made a cover of my favorite song so that it sounds like an anime opening! Was so cool hearing it!"
"Bro... they just sped it up. It's called nightcore."

mojyo

Romanization of 喪女, a Japanese word that means "unpopular girl". It is a shortening of モテない 女 (motenai jo) with the same meaning.
Popularized by the 2013 anime WataMote which chronicles the sad daily life of a mojyo named Tomoko Kuroki.

If you are a girl with no friends, are still a virgin, and never has been asked out... then you are a certified mojyo.