1. When you are speeding down the road and you come off a hill with a grade so steep that it feels like the bottom drops out of your stomach and your car seems to hover for a few seconds before touching back down on the road.
2. When you are speeding down the road and there is a sudden dip that seems to leave you suspended in mid-air for a few seconds, causing that fluttering sensation in your stomach.
3. Jumping so high while playing basketball that you seem to hang suspended, like Michael "Air" Jordan, before coming back down to earth.
Def 1 & 2: Man, I was driving down Gin Road last night, and just as I came up over Scratch Hill, I pulled some Dukes of Hazzard shit. We must have been airborne for a good five or six seconds. That's the best place in the county to get air.
Def 3: I don't know if it's his new kicks, or that basketball camp he went to this summer, but Dwayne gets some serious air on his jump shot now.