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1. white crayon
Someone who is utterly useless. Refers to the least-selected crayon in the box.
I don't know how that guy ended up getting promoted, he never does ANYTHING. He's a White Crayon.
2. white crayon
A seemingly useless crayon on white paper. But when paired with darker colored construction paper a whole new world is invented.
Briana put the white crayon to use by drawing on black construction paper.