urge to merge 

the tendency (usually attributed to lesbians) to become the same person. They start wearing the same outfits, doing everything together, essentially becoming the same person at the horror and disgust of their friends.

Alice: Have you seen Dana and Tanya, they are wearing the same outfit in similar colors.
Shane: must be the urge to merge.

urge to merge by shaazaaam December 21, 2008

urge to merge 

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.

urge to merge by Johanna Karlsson June 16, 2008

urge to merge 

When two lesbians get together, and almost instananeously become THE SAME FUCKING PERSON.

trumpet and jeni got dat baaaaad urge to merge lolololol111!

urge to merge by lesbojo March 22, 2010

urge to merge 

Wanting to have sex; desire for intercourse; horny.

Hey honey, come over here, I gots the urge to merge!

urge to merge by Ignatz April 11, 2008