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The process by which foreigners living in the US find their tolerance for cornyness significantly increased, i.e. by getting teary-eyed when watching a presidential address, developing a need to cry and tell your friends you love them on a daily basis, or by getting strongly emotionally involved in the Chris Brown/Rihanna affair.
Terry: Wow, did you see that exchange student tear up while Obama talked about the whispers of the dead soldiers in Arlington?

Jane: I know, it didn't take long for Americornization to kick in
by EBinDC March 28, 2009
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