Buffalo bookmark 

wiping feces on the page of a book

Jay was mad at Dave so he took his anatomy book into the bathroom at left a Buffalo bookmark on the day's assignment.

Buffalo bookmark by matthew rivers July 2, 2007

buffalo bookmark 

marking the page of a book or other publication with feces.

Taking a book off the library shelf and bringing into the bathroom to smear shit on a page

Angry at his friend, he took his science book and put a buffalo bookmark on tommorrows assignment

buffalo bookmark by matthew rivers July 14, 2007