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.
by the anonymous turkey October 29, 2020
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.
by Funnypicklez December 23, 2011