A seater refers to a pillion ride on the seat of a bicycle. Also known as a 'backie'.

A person, usually female, with an arse so enormous it takes up two seats on a bus or other public transport. The sight of this apparition Is so remarkable that owner ceases to be a person and become just a mobile arse. The next stage usually results in the disbelieving mind asking a number of questions such as “Is it an elephant in disguise?” “How did it get into those jeans?” “Does it have its own Facebook page?” “Are the seats going to collapse?” This is usually followed by wondering “If it escaped would it attack people and ravage the countryside?” This in turn is followed by the heartfelt prayer, “Please don’t let it fart!”

A bowel movement so explosive in nature, that the force of the resulting splash coats the underside of the toilet seat with fecal matter.

Someone so obese, they take up two seats on an airplane, bus, or train. Bonus points if said person has to buy two tickets.

shitting yourself in a car without seat heaters

another name for a seat heater. generally located in the driver and front passenger seats in cars.

A restroom, usually in a gas station, that only has one toilet. Sometimes is shared by both sexes.