A diesel dyke is a term used in some lesbian circles to refer to a lesbian who has a masculine or “butch” look and an aggressive demeanor. She is likely to take on personal qualities that are more associated with men, such as aggressiveness. She may also be referred to as a bulldagger.
More About Diesel Dyke
The use of the word “diesel” to describe a very masculine lesbian may stem from an association with heavy equipment or a big-rig tractor/trailer. The term is also typically used to refer to a larger person.