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2.
two old men having sex.
when old, one fails to cum on the job. fail job can also be an extreme term for failing.

"Wow, you lost your keys again!? your such a fail job!"
by bethxthexloser February 08, 2009
 
1.
Low-skilled and low-income job. Usually without any career opportunities, dull and uninteresting. Probably will be done by robots in future.
John got a failjob, he is working at McDonald's.
by nulle April 08, 2011