A Youpje is a phrase used in the popular school Cambreur. It is the action in which you jump off a set of stairs and try to look cool before realizing nobody cares and you're just making a joke of yourself.
"What the fuck are you doing? A Youpje won't help ya to become friends with us"
A so called "Jipje" is used as a term in field hockey when a person is just standing next to the goal and steals your goal by just pushing it into the goal.
Fuck you bitch, why did you steal my goal with that Jipje
A Cambreurtje is someone that is currently following an education in the secondary school known as "Cambreur". It is also known as a cambnertje.
"Don't talk to him, he's a Cambreurtje"