It refers to something annoying, rat-looking, in a way ugly, loud and tiny. Used separately in response.
Stephanie: OMG the way he ran was soo funny!

Nicole: I know right! His face! Like a chihuahua!

Stephanie: hahaha
by latinaIdontcare March 29, 2014
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to be utterly excited about something to the point of near uselessness.
Did you see how excited Bill was when he met Mary? He was shivering like a chihuahua!
by Silver Moose April 28, 2010
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