Knee-high to a grasshopper
Definition 1 of 1
Pro Tip 1/3Colloquial Metaphor
The phrase is metaphorical, comparing someone's height to that of a tiny insect. 
Look how tall you've gotten! Last time I saw you, you were knee-high to a grasshopper.
Pro Tip 2/3Informal Context
Used in casual conversation, often among friends or family as a playful remark. 
My, haven't you grown? You were just knee-high to a grasshopper when we last met!
Pro Tip 3/3Exaggeration
It's an exaggerated expression for emphasis. The speaker doesn't actually compare to an insect. 
He claims he's been fishing since he was knee-high to a grasshopper, but that's just a wild exaggeration.
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