An area of an email or a section of an email that should be deleted prior to forwarding or showing but is not. Instead it becomes a dangler, and hides in the body of the forwarded email until it is read by someone who will be unintentionally affected by it.
Oh man, we just got busted by a dangler. When I forwarded Shannon that thread we had going last week, I forgot to delete that section where you said she had a giant booty. Sorry!
When you are about to finish taking a dump but there is a small turd still hanging above the bowl and you can't squeeze it out, so you have to shake your butt around the toilet until it falls off.