Fee fi fo fum are nonsense syllables which appear in an old-time fairy tale called "Jack and the Beanstalk." In the story the scary giant says it.
And it's the name of a song by The Cranberries.
Fee fi fo fum,
I smell the blood of an Englishman:
Be he alive, or be he dead,
I'll grind his bones to make my bread!
A grotesque-looking female who is obese and/or large in overall size. Just by looking at her, one draws similarities between her size and that of the giant from the "Jack and the Beanstalk" fairy tale. Visualizing her as the evil giant could also take place during this brief moment.
Banter in which the classic English poem Fee Fi Fo Fum is edited for the purpose of banter. It is known in the British advert for weetabix where the tiny littledickhead boy says FEE FI FO FIX IVE JUST HAD MY WEETABIX