[T]he word appears first in the long forms, bulldiker and bulldyking, both used in the 1920s by American blacks. No African antecedents have been found for the term, however, which leads to the possibility that this is basically just another backcountry, barnyard word, perhaps a combination of BULL and DICK. [Rawson]
来自dike拼写变体,词源同dig,ditch. 女同性恋义词源不详,可能来自dyke的俚语女阴。