This is the 13997th most frequent Turkish word.
mesajlarının
"Of your messages" or "your messages'."
Possessive case usage showing ownership of the messages by a singular friend.
Arkadaşının mesajlarını okudum.
I read your friend's messages.
Possessive pronoun usage indicating that the messages belong to 'you'.
Mesajlarının içeriği oldukça ilginçti.
The content of your messages was rather interesting.
Genitive form indicating 'your messages' in the context of necessity for sending.