crusts

1. A more solid, dense or hard layer on a surface or boundary.
2. The external, hardened layer of certain foodstuffs, including most types of bread, fried meat, etc.
3. An outer layer composed of pastry
4. The bread-like base of a pizza.
5. The outermost layer of the lithosphere of the Earth.
6. The shell of crabs, lobsters, etc.
7. Nerve, gall.

   You've got a lot of crust standing there saying that.

8. A living.

   to earn one's crust

1. To cover with a crust.
2. To form a crust.

noun

A subgenre of punk rock, derived from hardcore punk with extreme metal elements, often with pessimistic lyrics about political and social ills.