A “Diesel Dyke” is a very dominant lesbian.
Imagine a large, tattooed trucker, but only in female.
Diesel Dykes usually sport short hair cut en brosse (a crew cut for those that don’t get out much) and dresses in masculine clothing such as dungarees or overalls.
Diesel Dykes are normally the dominant partner in a lesbian relationship and are also known as “Bull Dykes”.
“That Diesel Dyke threatened to punch my lights out if I didn’t get out of her way!”.