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Her (as in 'her brain is bigger than everyone else's') + my (as in 'my brain isn't as big as that') + oh (as in 'oh, for a brain that size') + knee (as in 'I've bruised my knee').
This used to be the most frequently asked question of all, but it has become less so since I cunningly had Hermione tell Krum how to pronounce her name in 'Goblet of Fire'.