Top Definition
Instasweat is a condition where a person becomes instantly covered in sweat upon entering an area of intense heat and 100% humidity. Instasweat is the result of sweat not being able to be evaporated from the body due to the combination of high heat and humidity conditions in the environment.
I went out on the porch to have a smoke and within seconds found myself covered with instasweat.
by KJ&CLKemp August 10, 2010

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