eehee is a little giggley noise of embarrassment or happiness, commonly made by chibis and adorable children.
i.e. 'aaaww you look so sweet'
'eehee thank you!'
The way some young children may say the word "elephant," if they are unable to pronounce it correctly.
When I was little, I used to call elephants "eehee"...
Aw, that's so adorable!
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