In real life, Hot Air either means a Lie or a Fib, otherwise it's the Assigned Amount Units credits given for the reduction of Greenhouse Gas emissions among the Former Soviet Bloc countries in economical terms. Hot Air is also used in Hot Air Balloons to keep them floating.
This is the strongest Cold Caller attack.
An attack similar to this is Fired, which can only be used by Tightwads.
In Toontown, Toons are usually confused between this and Fired.
Ironically, this move is used by an ice-based Cog.