The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D. Copyright (C) 2007 by HarperCollins Publishers. Cite This Source
Idioms and Phrases with bright-eyed and bushy-tailed
Eager and alert, as in Here is my new kindergarten class, all bright-eyed and bushy-tailed. The allusion here is to the appearance of a squirrel, which with its beady eyes and bushy tail looks ready for anything.