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The annoying habit of "drawing" on toast with a stick of butter, thus turning the end of said stick of butter into a crumb-filled mess. While using a stick of butter in this manner to butter your toast may seem more efficient than getting a butter knife dirty, it ultimately will just anger your spouse/roommate/friend -- because nobody wants toast crumbs on their baked potato.
"Brad's doing that butter crayon thing again, so I had to cut the end off the butter."
"Ewww, I wanted some butter on my broccoli but someone made a butter crayon out of the last stick!"
by IrisLaRue April 19, 2010