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Definition6-to-9 / six-to-nine , an orthographic variant for 69 / sixty-nine, mutual oral sex between two people of the same gender or of opposite gender.
Synonyms: flip-flop; double header; double marriage; head over heels (in love); loop-de-loop; (play) hoop snake(s); p's and q's; 69; soixante-neuf (French); vice versa.
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