This is the 3873rd most frequent Polish word.
prof
"Prof" in Polish is an informal abbreviation for "profesor," meaning "professor" in English.
In this sentence, 'prof' is used as a title and abbreviation for 'profesor', referring to a professional academic.
Profesor Nowak jest znakomitym wykładowcą biologii.
Professor Nowak is an excellent biology lecturer.
Here, 'prof' is colloquially referring to someone who has achieved the status of professor.
Mój znajomy został profem na lokalnym uniwersytecie.
My friend became a prof (professor) at the local university.
In this context, 'prof' is colloquially used as a term for a teacher or professor.