In Spanish slang, 'mamoncillo' is often used to describe someone who is annoying, irritating, or bothersome. It can also imply someone who is overly sensitive or immature.
Examples
- Spanish: No invites a Juan a la fiesta, es un mamoncillo que siempre se queja de todo.
- English: Don't invite Juan to the party, he is an annoying person who always complains about everything.