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1.
A five-part sexual combination. The original Cave Canem consists of the Lying Dog, Doggystyle, the Standing Dog, the Wheelbarrow, and the Hoover Maneuver.

A variation of this combination instead starts with the Lazy Dog, then proceeds through Doggystyle, the Standing Dog, the Wheelbarrow, and the Hoover Maneuver.
Back in college we used to keep track how many girls we could Cave Canem.
by Warmpain May 01, 2010
 
2.
Beware of Dog. Latin phrase still used in English.
As we approached the fence, a sign with a painting of a huge, fierce dog read "Cave Canem".
by David Barnes March 11, 2004