Bifanual 

A person that is a true fan of two teams that are competitors in the same sport and in the same area.

She is "bifanual" because she is a fan of the Jets and the Giants. Or the Yankees and the Mets. Etc.

Bifanual by jax beach lover April 24, 2010

bimanual synkinesis 

Mirror Hands. A neurological condition. What one hand does, the other copies.

Oops, sorry I grabbed your boob, I was going for my drink. Must be my bimanual synkinesis.

bimanual synkinesis by caradea August 2, 2012