digital canary

Sealing one or both nostrils while voiding excrement in a closed space (as with a finger). Following excretion, the seal is removed. This allows an accurate measure of the space's ambient odor.

"Chicks are the chess of deucin'. Courtesy flushes, lipstick lighters, crap gaskets, digital canary… She presses one nostril shut the whole time, then uses the fresh nostril to gauge things at the end. Like a pregnancy test."