The term 'corte de pastelillo' is not a common slang term in Spanish and it doesn't have any particular slang meaning. Literally, it translates to 'piece of pie' or 'pie cut'. It could potentially be used in the context of sharing or distributing something.
Examples
- Spanish: Vamos a hacer un corte de pastelillo para ver quién se queda con la casa.
- English: We're going to make a 'piece of pie' to see who gets the house.