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A blow job from a girl, specifically a girl called Fran. Usually involves hard graft from the recipient prior to said 'grandadio' - proof that they are under the thumb of this 'Fran' character.
Friend 1: Hey, you wanna grab some beers?

Friend 2: Sorry, got to work hard for this 'grandadio'
by Your Priest March 14, 2014
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