Generally refers to a "nothing" hand or a hand with zero value, as in "I bluffed him with total air and won."

The term also is used sometimes in lowball drawing games (e.g., deuce-to-seven triple draw) when letting an opponent know on a given betting round one's intentions on the next draw, wherein "giving air" means indicating an intention to draw cards in order to get an opponent to stay in a hand. "He was going to fold, but I was giving air that I would be drawing two and so he called."