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1.
only dating someone for the sole purpose of preventing someone else from dating them
"I don't want to go out with her but I'm going to just so you can't." Defensive dating at its best.
by omglolwtf#winning October 14, 2011
 
2.
Only making a move when one sees an opening. Sometimes mistook as chivalry, sometimes mistook as being a pansy. Always rewards for flirtatious and engaging behaviour.
Sally: We've gone out twice now and you haven't even kissed me. Are you into me or not?
David: I'm defensive dating, and you didn't seem all that interested in getting physical.
Sally: Kiss me, you fool.
David: Awesome.
by gimmickless December 03, 2009