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1.
Practice of filling all 3 orifices of a female by either penis, or objects.
A penis in the ass, pussy and mouth at the same time, or a combination of penis and vibrator/dildo.
My wife likes to be made airtight by having my cock in her mouth, a plug in her ass, and a vibrator in her pussy.
by Slugster August 04, 2005
 
2.
When a girl takes on three guys at once, one in the ass, mouth and the pussy. All at the same time; hence see becomes, air tight.
Man we had a DP going and then she took another cock in the mouth, shit she was air tight.
by Dave May 14, 2004
 
3.
Whilst in the act of triple penetration, each cock filled cavity seals every possible air path of entry or escape thus causing an immensely pleasurable (I said pleasurable bitch!) sensation for the female recipient, as her body becomes akin to a vaccuum sealed container. Also see, Tupperwhore.
Samantha was absolutely dying to become airtight; she really was. Elaine's airtightedness was the perfect environment for the long-term storage of my balls. "Plug Jessica's nose Jack! She's trying to cheat by breathing through her nose!!!"
by Ryan August 13, 2003
 
4.
noun/adjective/verb : being SO tightly shut that air ceases to exist inside.
She is like fort knox because she is so airtight its not even funny.
by ABomber3113 January 09, 2009
 
5.
no flaws,lacking any weaknesses
My game is aurtight mark-ass square
by WhiteFolks September 28, 2003
 
6.
VERY ATTRACTIVE! Generallly in reference to the female of the species.
Feast your peepers on Mabel! That little Barlow is AIR TIGHT!
by Bob Proczko October 16, 2006