A/N: 69th definition, of course HAS to be 69.

69

Simultaneous oral sex. Can be practised by M+M, M+F or F+F.

The reference is that the numerals 6 and 9 are inverted versions of each other, reflecting the physical position that the couple must adopt when engaged in this sexual practice.

The internet's favorite number next to 21 and 420.

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