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A face-to-face blow job that happens when someone takes off their false teeth and goes all in.
My grandma's gab sesh was legendary, she took off her dentures and said, 'I'm gonna make this count.'
He pulled out his dentures and said, 'This is not a gab sesh, this is a gab explosion.'
At the nursing home, they call it a 'gab sesh' because it's like a party for the mouth.