1- A person you consider your friend, but not your most favorite person.
2- secondary bestfriend.
"I was at the mall the other day and saw my bff jill. i was dreding every second of that hideous conversation."
In reference to Best friend forever, as in the commercial...
Mom: Who are you texting so much?
Girl: I DK, my BFF Jill
Anyone you hang around a lot, for work related reasons or otherwise, even if they aren't your best friend.
RIck: AnnMarie, where is your BFF Jill?
AnnMarie: I don't know. I feel lost without her, we've got to get this project done for Monday.
hold out your right hand in front of your face, fingers spread out, palm away - the fingers of your hand should spell out "jill" respectively; referred to when someone is suspected of masturbating
you were in your room for awhile. spending quality time with your bff jill?
your best friend forever
sometimes named juill
from the cingular texting commercial
mom: " you have you been texting 50 times a day?!"
stephanie: "idk, my bff jill?"