the term used in the gay community for the presumed tendency lesbians have of quickly moving together after dating for a short period of time. See U-haul lesbian
Although not unique to lesbian couples, this behavior is stereotypically attributed to lesbians.
The comedian Lea DeLaria joked:
Q: What does a lesbian bring on the second date?
A: A U-haul.
The U-haul joke symbolizes the lesbian urge to merge.