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4.
A retard not necessarily 100% to blame for their stupidity.

From John McCain's 2008 vice-presidential pick, governor Sarah Palin, who gave birth to a Down Syndrome-afflicted child at age 44.
My organization in general has lots of good people, but my team is led by a complete palinbaby.
by horizonstar August 29, 2008
 
1.
A mentally retarded person.
A person who is stupid, obtuse, or ineffective in some way: a hopeless social retard.
1. Don't be a palin baby.

2. Tommy acts like a palin baby around girls

retard
by 0utL4w April 04, 2010
 
2.
someone who seems to misunderstand everything, the longer the explanation, the greater the misunderstanding; speaking yet somehow out of the conversation; obstinately stupid; ignorantly ignorant
that dude is such a palinbaby!
by Geeebus March 16, 2010
 
3.
A perjorative to refer to a mentally- or developmentally-disabled person. Refers to Trig Palin, the son of Ex-Governor Sarah Palin.
See the definition for "Palin baby".
by Nickidewbear_Two August 11, 2011