Meaning "One
True Pairing", fangirls or fanboys often use it when describing a certain pairing. It is often used in regards to a fictional pairing in regards to a movie, book, anime,
manga, or other such series.
Sarah was a huge Harry
Potter fangirl, but was adamant in her beliefs that Dramione* and WolfStar** were canon,
even though her thoughts had been rebuked several times, by critics and fans alike. In fact, she even went so far as to consider Dramione her OTP!
*The ship name for Hermione Granger and
Draco Malfoy.
**The ship name for Remus Lupin and Sirius Black.