Dilly Bar

The small to large portion of skin on your lower back that is exposed when the shirt does not meet the pants. caused by too short a shirt, low pants, bending over or a combination of the three.
"oh man did you see the Dilly Bar on that girl when she bent down to pick up her pencil??"

or
"oh my gosh jen get a belt! your dilly bar is showing"
by Tritonof the sun! September 28, 2009
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