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1.
A sheet, towel, washcloth, shirt, napkin or other material laid upon the bed, counter, couch, chair, table or floor for the specific purpose of catching the load, jizz, cum from the ejaculation of a masturbating male. Drop cloths allow for quick, easy clean up.

Coined from the painting and coating trade whereby a drop cloth is used to catch drips, drops and over spray of liquid paint and coatings.
Stan surfed internet porn all morning during his conference call and found himself with an engorged chub. To get relief, he closed his office door and jerked off onto the drop cloth he laid on his desk. All pleasure and no mess.
by Stan's Drop Cloth March 31, 2014