What is "u-haul lesbian"

n. (context slang US derogatory English) In North American lesbian culture, a lesbian in a relationship that progresses very quickly, for example moving in together after only a short period of time.

U-Haul lesbian or U-Haul syndrome is a stereotype of lesbian relationships, referring to the joke that lesbians tend to move in together on the second date. It suggests an extreme inclination toward monogamy or committed relationships. It can be considered both complimentary and pejorative, depending on context.