Yes I did, yes I did
Somebody please tell em who the eff I is

from Nicki Minaj – Super Bass Lyrics on Rap Genius

Meaning

When a rapper wants someone to ‘tell them who i am/is’, it’s for a few reasons:

1) They are tired of telling people their name
And/or
2) They are so well known that other people can fill you in

This line also has the force of ‘Don’t you know who I am?’, where Nicki challenges the way she is being treated, and/or suggests that her reputation precedes her.

“Tell em who the eff I is” could be a reference to the much used phrase “Who do you think you are?” which is often used negatively.

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