A piece of ass

A kindergarten class was having a taste test.
The teacher blindfolded a boy and put a Hershey kiss in his mouth.
"I'll give you a hint," she said. "It's something that your daddy asks from your mommy every morning before he goes to work."

Then all of a sudden, a little girl from the back of the room shouts, "Spit it out! It's a piece of ass!!"