seat cleat

A dildo or any other similar shaped object fastened to the horizontal part of a seat or surface designed for someone to sit on to ensure said person does not slide off their seat.

Wow!!! Did you see Nick not fall off his chair when Rodney pushed him over? Luckily he was using his seat cleat.

seat scramble

Something you may call if you're with a bunch of seat checking nazis. If more than half the people agree to the seat scramble, all current seat checks are void.

So the ten of us got up to shoot some hoops at halftime, and seat checks were called. As we were heading in, Jon called a seat scramble, and everybody started grabbing new seats. Because of it, I ended up losing my massaging recliner.

lincoln seats

The seats in an opera/play/performance located in the upper section to the right of the stage.

Aww man, we in the Lincoln seats.

Glasswasher Seat

Seat at the bar where you have a great view of the waitresses cleavage while she washes glasses

Ryan and Eric draw straws in the truck for the seat in front of the glasswasher seat cause Katy has huge cans and a tank top on.

Courtesy Seat

The polite gap in seating given by to people in the same row. Applies everywhere.

The fat idiot on the bus took up the courtesy seat between me and that other guy.

seat cushion

It is where you create a space between a stranger and yourself so nobody that you don't know will sit next to you

I had to use a seat cushion because I was the first one to go into the row at the movie theater

Protagonist seat

In animes, the main character often sits in the seat farthest back (or second farthest back) and closest to the window at school.

-Man, Kevin got the protagonist seat
-What do you mean by protagonist seat?
-You know, the seat farthest back and closest to the window that the main characters in animes always sit in!