Can't find anything.
Unless you are referring to an air bubble, but that doesn't mean a huff.
Air bubble can mean a lot of things: annoyance, sighing, exhaustion, worry, anger, talking...
In Kid's case he was either annoyed from fodder or worried for his crew.
	
	
		
		
	
	
	
	
		
		
	
	
	
	
		
		
	
	
	
	
		
		
	
	
While huffing has it's own indication- a speech bubble 
literally saying 
huff huff