You might have to wait for the definitive answer from one of the Italian members or URmaniac, who lives there - but I think it means 'stuffed' or 'filled' with.... As in ravioli etc
Ripieni does refer to an item which is stuffed. But it's used for foods such as stuffed calamari, chicken, pork, etc. rather than the filling that is used for pastas such as ravioli, tortellini, etc.
Yup...ripieni means stuffed or filled as the above posters have mentioned.
'Pieno' means 'full' in Italian. Sono sempre pieno ( purtroppo)...lolol
So, the filling = il ripieno