1. A sexual activity involving an elderly woman having her way with the male's genitalia

2. Another way to say that a person's work was not to expectation, and usually done out of laziness
Mike: yo Derek shes so fine i just want to do her

Derek: yeah I guess, i like older women though, im into those Granny Jobs

Mike: oh wow

Or:

Nico: hey mark, this is not what I was expecting. What you have done here looks like a Granny Job

Mark: I did my best. I could start over if you want?
by ddrop213 October 28, 2011
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A blowjob from an old lady who has no teeth. The lack of teeth makes the experience awesome, however the incident is too embarrassing to tell your squad.
The granny gum jobs from old lady Jenkins was probably more erotic than anything I've ever had.
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