Attempting to make a joke before all the key parts that are necessary to make the joke funny are there; often with the hope that the missing parts will form by the time they are required.
Person 1: That was uncool.
Person 2: What's uncool is your... ... um... damn, premature ejokulation.
Person 2: What's uncool is your... ... um... damn, premature ejokulation.
by dh718 March 26, 2010