When you go underwater and the water goes in your nose causing the sour sort of sting, mostly happens when upside-down.
The boy almost got the keys from the bottom of the lake but he got Sour Nose and had to come back up.
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When you're about to cry and you're trying to hold your tears in. That tingling feeling in your nose feels a bit sour.
"Are you ok?"
"Yea, hol' up. I have a sour nose."
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