The story
The expression may have been originated in the early 1980s by comic Lea DeLaria, who joked: : Q: What does a lesbian bring on a second date? : A: A U-Haul.
Etymology from Wiktionary, CC BY-SA 4.0.
U-Haul lesbian
Today it means: A lesbian in a relationship that progresses very quickly, for example moving in together after only a short period of time. Full definition →