speak air 

Basically someone whos talking rubbish and its just air because everyone is airing it (airing it means ignoring).

all you do is speak air bruv no one is listening shutup!

speak air by ghettoaf April 10, 2016

Air Steak 

Noun.

An extremely odorous fart released in the vicinity of other individuals for their nasal consumption.

Recently, John served up a nice air steak for everyone on a commuter flight from Atlanta.  From the reaction of the nearby passengers, it was a very flavorful.

Air Steak by npgreek September 3, 2012