From the Urban Dictionary:
1. An applicant lacking even basic job skills
2. Someone supremely un-self-aware or lacking any relative sense of what he/she does or doesn't know.
HR sent me another Palin for the marketing manager job.
(v) to abandon one's principles for short term gain
Tom, a devout vegan, palined when he consumed a happy meal solely to obtain the collectible toy it contained.
1. Pejorative term that refers to an incompetent, impractical, irrelevant or incapable person who has been appointed to a position of great importance.
2. A person who holds authority disproportionate to his or her requisite ethics and qualifications. Derived from John McCain's controversial 2008 Vice Presidential pick, Alaska Governor Sarah Palin.
John was recently made principal, but everybody thinks he's a Palin who can't do the job.
My new boss is such a Palin - he took my deserved place because the CEO is his personal friend.
Update from the comments:
"My English teacher actually redlined something on a paper and made a nasty comment about a "Palinesque" sentence. It was a run-on, but that was uncalled-for."