To begin or start, usually associated with an event of some description.
"What time does the party kick off, Mr Ben?"
by Mr Ben February 08, 2005
When fucking a girl from behind, preferably on a bear skin rug, at the point of climax one blows a whistle, signaling three or four friends to burst into the room and kick the girl in the face.
"Hey guys, thanks for helping out with the kick off last night. Best. Anniversary. Ever."
by Oedipus Flex November 11, 2009