METH DUMP
Meth Dump; When a dissatisfied and soured customer returns to your place of business, with a huge gulp of kookabura coffee and takes a horrendous revenge dump in your employee bathroom without spraying air freshener or turning on ventilation fan or even flushing, as if they had been smoking meth.
"Mrs. Jones must have been pissed because she took a massive meth dump in the customer bathroom! WELL PLAYED MRS JONES. WELL PLAYED!"