This is the 13181st most frequent Polish word.
ojczymem
"Ojczymem" means "stepfather" in English.
Here, 'ojczymem' is used in its instrumental form to describe the noun 'my stepfather' while referring to his attributes.
Mój ojczymem jest bardzo miłym człowiekiem.
My stepfather is a very kind person.
In this sentence, 'ojczymem' in the instrumental form is used to indicate the person with whom the speaking occurred.
Rozmawiałem z ojczymem o naszych rodzinnych planach.
I talked with my stepfather about our family plans.
Again, 'ojczymem' serves in the instrumental case to denote accompaniment in an action.