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1.
Someone who doesn't contribute to a conversation and just stands around stealing your air!
Hey you see Anthony over there

'Yeah'
He's an air demon!
Why?
He's not speaking...just breathing

air stealer demon thieve oxygen
by AirDemon1 May 23, 2012
 
2.
alternate term for fart or passing gas
"nigga who let out an air demon??"
by retrac September 08, 2008