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When one leaves paper in a pants pocket then proceeds to wash said pants. This creates what is known as a "pocket pebble" because it resembles a small rock or pebble.

wadded up paper in ones pocket after washing clothes.
Keenan left his work reciepts in his pants pocket then washed them. When he reached in his pocket the following day, he found a pocket pebble.
by JColeman August 09, 2011
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