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1.
A visual aid to the outside temperature
Stick your tit out of the door love,and check the nippleometer, i want to see if i should wear my hat
by griggy October 18, 2006
 
2.
The gauging of a room or environment's temperature using the apparent hardness (or not) of nearby nipples.
I didn't really feel cold, but I was according to my nippleometer.
by EK the Bad Kitty April 06, 2006