In first grade (before I knew what it ment) I was sitting there wiggling a loose tooth with my middle finger. All of a sudden this kid comes out of nowhere and goes "Umm-um-mum-mum, I'm telling." And I'm like, "On what?" And he goes, "You stuck your middle finger up." And I'm like, "OK." So the teacher's like, "Don't do that again." And I'm like, "Why. What does it mean?" And she's like, "Just don't do it again."