Green’s Dictionary of Slang

1. a lesbian with a trace of a moustache on her upper lip [pun on dyke n. (1) + portraitist Anthony Van Dyke (1599–1641) who was thus bearded].

1966		Trimble 5000 Adult Sex Words and Phrases.
1972		B. Rodgers Queens’ Vernacular.
1982		Maledicta VI:1+2 (Summer/Winter) 132: Van dyke (‘lesbian with a moustache’ says one so-called authority, trying hard to be cute).

2. a lesbian truck driver [puns on SE van, a truck + proper name Anthony Van Dyke].

1972

B. Rodgers Queens’ Vernacular.