Ask PG: What Is An "Exploding Accelerator Offer"?

Yesterday on twitter [1] pg mentioned "exploding offers" from some accelerators, and to be honest, I'm just clueless by what that means in context. I've heard the phrased used in big company buy-out situations. An example might be the proposed acquisition of T-Mobile by AT&T having a condition where if the deal didn't get approved, then AT&T would have to pay a whole bunch to T-Mobile (for the brand damage etc.). Dan Shapiro (hn:danshapiro) submitted the tweet to HN yesterday during the most busy part of the day for submissions, so it didn't get much of a chance for up-votes. This morning I woke up wondering what the heck an "exploding accelerator offer" really is? How do they work? Is there yet another, umm, "non-transparent" or "potentially risky" investment practice that founders need to be aware of? (Yes, I intentionally tried to phrase it nicely since terms and practices are just terms and practices people/companies agree to) [1] https://twitter.com/paulg/status/321657682761232384 [2] https://news.ycombinator.com/item?id=5520295