yellow grease

noun

yellow grease

noun

1

Idiomatic Used vegetable oil purposed for use as biodiesel.

Using waste oil can be much less problematic, but in the US, waste oil is sold by rendering companies as yellow grease, and to a certain extent yellow grease is a substitute for fresh oil.2008, Forest Gregg, Christopher Goodwin, SVO: powering your vehicle with straight vegetable oil, page 4:

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.