Truckside advertisement is when big trucks that carry things like food, furniture or just about anything you can imagine, have really colourful pictures and messages stuck on the sides of them.
These pictures and messages are like big stickers called vinyl wraps that are put on the trucks so that when people see the trucks driving around, they can read what they say or see the pictures.
It's like when someone wears a t-shirt with a cool saying or picture that other people can read and see when they pass by.
This helps companies to advertise their products or services all around the city and even outside of the city because the trucks travel far and wide.
It's a bit like a moving billboard that can't be missed!