PreEmptive Mouse Share definition Flag When you know somebody is about to say 'Mouse!' to you, and so you say it first and undercut them. "Hey, James..." "Mouse!" Damn! Preemptive Mouse! PreEmptive Mouse by Cyrano "CJ" Jones June 7, 2011 0 0 Get merch Get the PreEmptive Mouse mug. Buy Now — $32.95 See more merch