ghosts of your paternal aunt
interjection indicates a strong feeling of distrust towards the other party's responses or claims. Used to call bullshit on someone's claims.
Ryan: I'm not touching or moving anything on your desk.
Ebi: GHOSTS OF YOUR PATERNAL AUNT! I just saw you grab a box of matches. Put it back!
Ebi: GHOSTS OF YOUR PATERNAL AUNT! I just saw you grab a box of matches. Put it back!