1. An informal shortening of "statistic," usually used in plural constructions. I found some interesting stats on declining birthrates in certain geographical regions of the world.

2. Right away; without delay. A shortening of the Latin term "statim," used especially in medicine (or as a parody of such usage). I'm losing the patient. I need 10 CCs of epinephrine, stat! Uh oh, I'm starting to feel sober. I need a pint and a shot of whiskey, stat!