putrescine
the chemical compound found in decomposing organisms responsible for the gag-inducing smell. Also linked to the odor of bad breath, and some vaginal infections. Makes for a great and unusual insult.
1) "The air is heaving with the scent of putrescine, suggesting we either have stumbled onto a dead body, or a nearby woman is having some feminine issues."
2) "You smell like putrescine!"
2) "You smell like putrescine!"