A word used to define the act of an offended type of body language when meeting or seeing someone for the first time. Usually consists of looking a person up and down several times in a rude sort of manner.
Mary: "Oooh, did you see that? That girl just gave you A Rachel"
Beatrice: "Oh yes I did, and she better watch it before I give her A Rachel back"
Pulling a 'Rachel' involves consuming enough alcohol to dissolve all moral values and exiting a party, only to re-enter, and plant a smooch on the first male figure in the room. Then, later actually fall in love with this lucky man and live happily ever after.
A Rachel BRB (be right back) is when one person says BRB on instant messager with the intention of signing off and returning at a much later time. It should be substituted with a BBL (be back later).
Rachel: BRB!
Bob: Okay.
Rachel: Signing off 5:30pm.
Rachel: Signing on 10:00pm.
Rachel: I'm back Bob: Away Message Response: Went to bed.
Hence, A Rachel BRB, and not a typical BRB.