Talk about unforced errors.
Personally, I would have gone with the fact anus is a cold, clinical term that is out of place in the organic flow of hip hop... unless you' have no flow like Macklemore or GEazy
It's not really an inside joke. He actually made a sycophantic alt named Rebecca, and he responded to those alt posts on his main with "Rebecca". He even made her borderline psycho with jealousy.