burn coal
Verb
Meaning
(literally) To burn coal, usually for heat.
(derogatory, offensive, ethnic slur) Of a non-black person, usually a female, to seek sexual relationships with black people, usually men.
Source: en.wiktionary.orgExamples
The waste from power plants is essentially what is left over when you burn coal. And as we all know, coal is a relatively dirty mineral.
And we have abundant natural energy resources in the country. We haven't been taking adequate advantage of them, and we can burn coal in a clean way; we could improve the grid.