Making a woman “airtight” is a sex act, also known as a triple penetration, that involves (usually) three men fucking her in her cunt, asshole, and mouth.
1. I went to the wildest orgy recently. Me and two other guys made this fat chick airtight, and then we gave her a bukkake.
2. I invited some buddies over last week, and we make Susan airtight. Now she doesn’t bitch about my friends coming over. She invites them.
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