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1.
A person with a head that seems out of proportion in comparison to his/her body. Rather than a large head and small body, a person who is a reverse bobblehead would have a large body and a small head.
Due to the increasing popularity of fast food restaurants, some people are starting to look like reverse bobbleheads.
by Lindsay91 December 23, 2007
 
2.
Someone whose head is too small for their body.
Person 1: Hey, have you seen Laura? Her tiny head is far too small for her giant body.

Person 2: I know! She's such a reverse bobblehead!
by the.pseudonym.is.a.lie February 19, 2012