From a poker playing expression, “read ‘em and weep” used when you finally reveal your winning hand to the other players, especially when they think you have nothing and are bluffing.
Basically the same as “In your face!”
It is when you send a myspace message to someone and when you go to the sent folder it will say that the person has " read" your message and did not reply back.
Me: UGH Jackie didnt reply back to my message!
Someone elese: Oh she read it and weep your message