OTP stands for On-Time Performance, in train lingo. It refers to the number of times that a given train, or railway company, had late trains.
The OTP is usually given in a percentage value, and refers to the percentage of trains that were "on time". Whether a train is on time or not depends on how long the route is. A train from Toronto to New York City has about 10 minutes leeway, but a train from New York to Florida would have to be about an hour and a half late before it was officially considered "late" in the books.
Canadian National had an OTP of 86% last year.
by That Train Guy March 14, 2009
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Top Definition
One True Pairing. Meaning the your favorite combination of characters in a fandom.
RON and Hermione are /so/ OTP.
by willow__tree December 27, 2004
One True Pairing in a work of fiction. Characters that a person thinks work well together.
Sirius and Remus are my OTP.
by Shananagin December 17, 2005
One True Paring.
Used in fandoms to espress what charaters you ship. (put together romanticly)
"So, do you like CJ and Toby (from the west wing)"

"yea, their my OTP!"
by Erin September 27, 2003
One true pairing.
Used in slash to describe a perfect couple
Ryan Ross + Brendon Urie= OTP
by QueenxSupreme April 25, 2007
One true pairing. A term you use to express a pair of people that are the perfect partner for each other. Gender doesn't matter.
by Bambispenis April 24, 2011
One True Pairing, used to describe a relationship in fiction texts (or sometimes real life) that you want to happen/ think works well together.
However I think that Only Tears and Pain is a better definition.
by tumblrgurl101 July 14, 2012
One true pairing. Usually involving some kind of fandom.
"What's your Glee otp?" "KLAINE IS MY OTP!!"
by KlaineOTP November 05, 2011
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