Okay, so this isn't a kindergartenism, but it was a funny story a second grade teacher shared the other day in the lounge:

A second grade class was in the computer lab and the librarian was showing them a website about animals. There were multiple animals to click on and the librarian asked the class which animal she should click on. A student blurts out "A fricken elephant!" The librarian scolds the student for using the word "fricken" and then the second grade teacher pulls the student out into the hallway to talk to him. After scolding the student again for blurting out and using an inappropriate word in school, she asks the student why he did it (this student is usually a really well-behaved kid). With a worried look on his face, the student replies "I meant to say African elephant!!" Haha!