birk·ie
(bûr′kē) Scots n. A man, especially one who is spirited and energetic.
adj. Lively; spirited; cocky.
[Possibly akin to Middle English berken, to bark, from Old English beorcan.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
birkie
(ˈbɪrkɪ) n1. a spirited or lively person
2. a foolish posturer
[C18: perhaps related to Old English beorcan to bark; compare Old Norse berkia]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014