Definition: "Sari" is a term used among South Asian communities to refer to women who are perceived as being younger and less attractive than their more mature counterparts.
In the context of your question about the slang word, "sari," one popular usage within the community could be: "If you're looking for a nice girl with beautiful curves but not too young or matured, then a 'sari' is a great choice." An edgy example sentence using "sari" in this context might be: "Sari, I'm talking about the type of women who are 30-40 years old and still look like they're younger. They have curves but not so matured that you feel uncomfortable around them."