Mm. Warriors' World never had any coherent, permanent system of magical communication, so I can't see magical phreaking developing there. However... I'd bet there's a term for that native to the Harry Potter world that Harry and his friends just never came across -- someone must be phreaking the phloo.
-- Bob
---------
Then the horns kicked in...
...and my shoes began to squeak.
-- Bob
---------
Then the horns kicked in...
...and my shoes began to squeak.