The frozen state of underarm sweat. Most likely caused by summer temperatures and humidity followed by lunch in a Chipotle.
The 115 degree temperature, excessive coffee and laughing lead to
pitting out, after which I entered a Chipotle and my
pitstains were turned into pitsicles. After leaving the Chipotle, which was maintained at an arctic 34 degrees, my pitsicles were once again pitstains.