The von Clausewitz Gambit is an unusual opening move on a dating app, whereby the person making the opening move delivers a pick-up line derived from Carl von Clausewitz, usually as a reference to his masterpiece 'Vom Kriege' ('On War').
"Did you see that screenshot Kevin put in the groupchat? He used the von Clausewitz Gambit on a girl he matched with on Hinge!"
"Yeah man that's insane, I can't believe it worked!"