Boy Howdy Meaning

(idiomatic) Expresses emphasis.

Example: 2005, Mark Alan Norris, Everything and Then Some, ISBN 1413488978, page 140:
  Boy howdy. There was indeed no rest for the wicked.
2010, Joe Barfield, Formula 2000, the Dream, ISBN 1458191281:
  I greeted Shannon's request enthusiastically, "Boy, howdy!"
2013, Honor James, The Rogue Hunter's Mate, ISBN 1622425510, page 60:
  "Talk to me, Zaidu. What do you mean?" she asked quietly. "I'm more than a little confused here. I know what's happening in my life." Boy howdy, did she!
2014, Steven Gould, Exo: A Jumper Novel, ISBN 146682848X:
  â€œBoy howdy, are you ever. You're on number four but there's no Doppler shift!"
1992, Hugh Ruppersburg, Georgia Voices: Fiction, ISBN 0820314331, page 460:
  Boy howdy, boy howdy, boy howdy! I was buried alive in noise, and the heat and cinders stung my neck and legs and the bottoms of my feet.
43, Carole Marsh, Heroes & Helpers, ISBN 063501078X, page 2002:
  Boy, howdy, is it cold! This is not Paris, as in "gay Paree," in France.
2004, Will Hancok, All 'Bout Me, an Arkansas Tail, ISBN 158961268X, page 171:
  l saw her just a standin' there with her little blue suitcase and l said, 'Boy howdy, would l like to crawl into her pants!'
2007, Olive Ann Burns, Cold Sassy Tree, ISBN 0547416121, page 77:
  If there wasn't a dragging brake beam to rip me down the back, I was go'n make it! Boy howdy, I did some fancy praying.