From 'Trop Tard,' literally "too late" in French.
Taken to mean someone who is compulsively late, or in the wrong place at the wrong time. Generally useful in any situation in which one wishes to degrade someone who is not on time for any reason.
"What? John's not going to be here til 11. How mich is that?"
"Totally. Let's ditch the Troptarded D&D-mo before he messes with our plotfuckery."