This is the 13072nd most frequent Russian word.
марокканцем
The Russian word "марокканцем" means "Moroccan" (male, instrumental case).
In this sentence, 'марокканцем' is used as the instrumental case, denoting an interaction with a person of Moroccan nationality.
Вчера я познакомился с марокканцем в университете.
Yesterday I met a Moroccan at the university.
Here, 'марокканцем' describes the nationality of someone's father in its instrumental form, suggesting a quality of being Moroccan.
Его отец был марокканцем.
His father was a Moroccan.
In this example, 'марокканцем' refers to the acquired nationality of her son in its instrumental form, emphasizing the act of becoming.