“Holy jalapeño!”

“Holy jalapeño!” is an expression of surprise or astonishment that has been cited in print since at least 1977. Several foods with jalapeño peppers have been named “Holy Jalapeño.”
 
“Holy mackerel!” is an expression of surprise that has been cited in print since at least 1867. Similar food expressions (some also rhyme with “holy”) include “Holy cannoli!”, “Holy guacamole!”, “Holy pepperoni!” and “Holy shiitake!”
     
 
Google Books
October 1977, Texas Monthly, pg. 74, col. 4:
Holy jalapeño! Enter another Texan in the Guinness Book of World Records. San Antonio’s Jose Garcia took a deep breath recently and promptly ate 60 (count ‘em, 60) stinging hot jalapeño peppers in ten minutes flat.
 
5 February 1993, The Times (Trenton, NJ), “A setback can bring indigestion” by L. A. Parker, pg. C6, col. 1:
Holy Jalapeno!
 
Google News Archive
3 May 1995, Reading (PA) Eagle, pg. A2, col. 5:
Holy jalapeno! It’s official
Another burning issue is on its way to the governor.
 
A resolution declaring the jalapeno the official pepper of Texas passed the Senate on a voice vote this week.
 
Google News Archive
25 November 1999, Shelton-Mason County Journal (Shelton, WA), pg. 14, col. 1:
Holy jalapeño
It’s time for chili
cookoff, auction
 
Urban Dictionary
Holy Jalapeno Batman
A term used when anything is exceptionally crazy, intriguing, or spicy.
Holy Jalapeno Batman, that dude has man-boobs!
by speediesnail September 12, 2005
 
Facebook
The Burger Stand at College Hill
May 18, 2013 · Topeka, KS ·
Good news! The Holy Jalapeno burger is going to become part of our standard menu!
 
Twitter
Mark C. Anderson
‏@MontereyMCA
Holy jalapeño that’s a popper w pepper jack, cheddar and cream cheese in tempura with bacon ranch. @… http://instagram.com/p/tvZ6JxGDnX/
Monterey, CA
1:30 PM - 4 Oct 2014