This phrase is not slang, but a common saying in Spanish. 'El deber antes que el placer' translates to 'duty before pleasure'. It is used to express the idea that responsibilities and obligations should be fulfilled before engaging in enjoyable activities.
Examples
- Spanish: No puedo ir a la fiesta esta noche, tengo que estudiar para mi examen. Ya sabes, el deber antes que el placer.
- English: I can't go to the party tonight, I have to study for my exam. You know, duty before pleasure.