Top Definition
The outline and shape of diapers showing through from under outer clothing being worn over top of the diapers. The tell tale sign and indication that diapers are being worn. Diaper lines, the outline of bulky diapers.
Several of the children at the birthday party displayed diaper lines.

Even through the baby's baggy pyjama bottoms, visible diaper lines could be seen.
by Lorraine Jorgenson. September 25, 2006

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