The cake, which did not contain poop but was made to resemble human feces, was made by the Cape Coral Post Office manager to represent the "poopy day" they had as a result of receiving a low score from a mystery shopper sent to score the performance of the office, WZVN-TV, Naples, Fla., reported.
"I thought it was appalling. I thought it was degrading to the employees and I just couldn't believe it," said Southwest Florida American Postal Workers Union President Sam Wood.
The U.S. Postal Service apologized for the incident in a statement.
"This unfortunate incident demonstrates poor judgment on the part of the responsible party, and does not represent the professionalism of postal managers in the local community and across the country. The Postal Service apologizes to employees who were offended," the statement read.