Meaning of all the Aberforth goat jokes?

[career advisor]

No: HPFGUIDX 177248

I didn't understand all of Dumbledore's goat jokes until today when playing around with various obscure word lists I found this:
   
  Geotic
  Magic \Mag"ic\, n. [OE. magique, L. magice, Gr. ? (sc. ?), fr. ?. See Magic, a., and Magi.] A comprehensive name for all of the pretended arts which claim to produce effects by the assistance of supernatural beings, or departed spirits, or by a mastery of secret forces in nature attained by a study of occult science, including enchantment, conjuration, witchcraft, sorcery, necromancy, incantation, etc.

An appearance made by some magic. --Chaucer.

  Pronounced geo-tic, but you can mispronoune it ad go-atic.Most references refer to it as 'dark magic'
   
  A pun by JKR? Were the charms that Aberforth performed on goats a refernce to dark magic. Was Aberforth at one time playing with dark magic? 
   
  What do you think?
   
  ~ DA Jones    
   

       
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