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1.
conjunction of impossible and positive

a) when something sounds too good to be true

b) when someone is way too optimistic about the outcome of a certain decision
a)
They offered you a job starting at 80k and they also pay for your MBA? That's gotta be impositive!

b)
dude 1: "You sure you can win this poker game?"
dude 2: "Sure? I'm gonna set a new record, dude!"
dude 1: "Man, you are impositive!"
by ricci-s November 24, 2009