This is the 11658th most frequent Polish word.
kogokolwiek
"Anyone" or "whomever."
'Kogokolwiek' is used here in the negated context of not seeing any person.
Nie widziałem kogokolwiek w parku o tej porze.
I didn't see anyone in the park at this time.
'Kogokolwiek' functions within a question to ask about acquaintance with any person.
Czy znałeś kogokolwiek na tej imprezie?
Did you know anyone at that party?
'Kogokolwiek' is used in the conditional context, relating to the possibility of contacting any person.