Green’s Dictionary of Slang

negative perspiration! excl.

(US) no problem!

1970		oral testimony in Lighter HDAS II.
1983		S. King Christine 496: I felt a large plastic smile on my face. ‘Sure. Thanks.’ ‘Negative perspiration,’ Arnie said.
2002		Travis & Kristian Bitch-and-Moan.org Journal 27 Aug. 🌐 Thanksgiving Day is also when we put up the Christmas tree. No problemo. Negative perspiration, etc.