What does lesbian 69 mean?

A Lesbian 69 means..

Two females lay opposite ends to each other (One female has her head at the top of the bed, and the other female has her head at the bottom of the bed - Their heads in between the other females legs) and they eat or lick each other out at the same time.

The phase "Eating out" is American. As the phase "Licking out" is English. But now the English use both.

Hope this helped.