"I've Got Your Back"
Used most commonly with AIM or instant messaging, when one person misspells a word, and the other person corrects it for them.
Boy: I kinda get horney when your mom coms over.
Girl: igyb :-)
I Got Yo Back. :3
IGYB...I sent an angel to watch over you at night. The angel came back a few minutes later and told me angels don't watch other angels.