malodorous matter
malodorous substance

Beckman's solution was to make ink with butyric acid, a malodorous substance.

BMI (malodorous substances) - delivery systems for such substances are problematic.

Once healed your piercing may secrete a semi-solid white malodorous substance from the oil glands called sebum.

Packer has also pulled some considerably cruel jokes on Michael as well, such as in the episode "The Carpet", wherein a highly malodorous substance has been left in Michael's office.