An exclamation of enthusiastic agreement which can be used in both a genuine or sarcastic tone. In addition can used to add emphasis to a statement, much like the word fuck can.

Boy Howdy was also the name of an American country music band from the 1990’s. The term has not direct link or reference to them however.

As Agreement (genuine):

Joe: Mrs. Robinson sure is one MILF
Tom: Boy howdy!

As Agreement (sarcastic):

Johnny: Don't you just love pointless office meetings where the company tries to rah rah rah you into caring about sales?
Roberto: Boy howdy do I ever!

As Emphasis:

Norman: Boy howdy am I hungry, let's consume tacos!
by Venasque May 17, 2006
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Southern slang. An interjection. Often used as an expression of surprise for large quantities of something, or severity of something. See yessum.
"Boy howdy! Them pumpkins sure are big! How're we gonna carry 'em all, Ms. McGregor?"
by Fugerko.? December 24, 2003
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General expression/interjection, similar in usage to "wow," "oh, man," or "yep".
"Did the colonoscopy hurt at all?"
--"Boy howdy!"
by Swid September 10, 2002
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cultural references:
-Was the favorite expression of Lee Majors as Heath on "Big Valley"
-Name of mascot for CREEM magazine (not porn, it's a longtime publication for rock music fans).
"Boy Howdy!"
by Dan February 2, 2004
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1. Expression similar to "Oh, gosh".

2. Expression meaning "Oh, gosh, I'm a hick". If you can use "boy howdy" in a sentence with a straight face, you're about as far out of the urban mainstream as I can imagine.
1. Boy howdy, those sure are a lot of apples.

2. Boy howdy, I'm goin' to the big city. Topeka, here I come!
by asdf.what January 29, 2004
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A term that generally makes no sense at all, used to describe a feeling of happiness or enjoyment. Can be used with an exclamation mark for added excitement.
Carlos: We're going to the movies with a really hot chick tonight.
Diego: Boy howdy!
by MrDinkleberry November 21, 2005
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From 'Glee' - "Your wife will be pushing out a baby of her boy howdy in five months."
by CharlesCarmichael September 24, 2009
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