I don't believe it
Did you c that Mark gave his final rose to that Shedevil!
I kno! IDBI!
|GICBTS||Gosh, I can't believe that stuff|
|BION||Believe it or not|
|Oh snap||Expression of surprise|
|Whoa||Expression of surprise|
|AYS||Are you serious?|
|AYKM||Are you kidding me?|
|GICNBY||Gosh, I cannot believe you|
IDBI stands for I don't believe it. Incredulous people sometimes send this acronym in chat and text messages, after you tell them something they just can't believe.
Often, you'll see IDBI accompanied by one or more exclamation points (e.g. "IDBI!!!"). The more exclamation points, the more excited and/or shocked the person who sent you IDBI is.