When one can tell the outside temperature by the hardness and/or level of protrusion of one's own nipples. in other words, your mammaries are a thermometer.
Pedestrian 1: "Wow it's colder outside than I expected."
Pedestrian 2: "Yeah, my thermammeters are reading 10 degrees"
Pedestrian 1: "I believe you, they're poking through your shirt"
by fernandoumatilla December 04, 2010

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