The act of airing out your day-old clothes when you don't have a change of clothes handy. Often occurs after getting drunk at happy hour and crashing at someone else's pad on a work night. Can also occur due to poor laundry supply management skills (i.e. running out of clean clothes because you're too lazy to do a wash). Especially applies to underwear. Not nearly as effective as water, but yet gives a hint of cleanliness, albeit only for a few seconds.
Jimmy and I got so shitfaced at happy hour last night that I had to crash at his place around the corner. I didn't have time to drive home, so I had to do an air wash this morning.