And I quote:
A social engagement with a member of the appropriate sex, in which it is ambiguous if there is a romantic undertone to the evening; particularly when one is afraid to bring up said romantic possibility as a topic of conversation, for fear that the other person will clear up the ambiguity by responding in the negative.
Used in a situation like this: "So, did you go out with her?" "Yeah." "You don't sound excited." "Well, it turned out to be a Heisendate." "Ouch. That's awkward." "Yeah. Maybe next time the wave function will collapse."
From Heisenberg's Uncertainty Principle and "to date".
Heisendate and definition are
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