OTS
Off the subject
Example
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Usage
Last Updated: April 14, 2017
On the scene
OTS tells someone you are at a specific location, or "on the scene." People primarily use it on social media and when texting.
The "scene" in OTS refers to a place where an event has already taken place or will take place. You will most likely see this when meeting up with one or more people and somebody gets to the location before the others.
The person may text OTS to tell the others that he has already arrived and is waiting. The meet-up may be to go to a movie, out to eat, dancing at a club, or a friend's house to play some DnD.
Example
Rest easy, Cartman is OTS
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Usage
Last Updated: March 23, 2021
Open two-seater
OTS stands for "open two-seater," which refers to a two-seat convertible automobile. It is most often used in online forums that revolve around discussing cars.
OTS is an obscure acronym, primarily used only by car enthusiasts when describing the seating layout of a convertible sports car. Anyone who has an uncle who loves cars most likely has heard or seen him use this acronym.
Besides online forums, you may also see it on social media when people post pictures to brag about their cars. Or, you may see it at classic car auctions online or in-person.
Example

An OTS by the sea
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Usage
Last Updated: January 5, 2021
A transitional phrase that may be used before making a statement that is unrelated to the previous subject; similar to OT used in online forums.