YOU SAID:
I met my friend the other day
INTO JAPANESE
先日友人に会った
BACK INTO ENGLISH
I met my friend
INTO JAPANESE
私は私の友人に会った
BACK INTO ENGLISH
I met a friend of mine
INTO JAPANESE
私は私の友人に会った
BACK INTO ENGLISH
I met a friend of mine
That didn't even make that much sense in English.