when two or more girls have sex with the same guy they become sushi sisters
Jane: "wow did u fuck dan"
Jane: "now we're sushi sisters, want to scissor"
Women (usually Metro Women) who have a friendship based on "things in common" rather than the actual basis of most freindships. Not to say they are not close. Same birthdays, star signs, age etc. etc. etc.
Those gals are Sushi Sisters! They are one and the same!