Blowing Rock is sexual-slang, and a euphemism, for fellatio.

In the first movie of the Airplane series, the emergency automatic co-pilot is named "Rock". When this legless inflatable doll starts to collapse, the emotionally disabled fighter pilot who has been pressed into service as the airliner's pilot instructs the female cabin attendent to reinflate it using a tube at its base. She replies "You mean -- we're going to have to -- blow Rock?".


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