“Lactose intolerant” is sometimes jocularly called “lack toast and tolerant.” “Big Mistake of the Day: ...lack toast and tolerant ...” was cited in print in 1997. “Lack-toast intolerant” was cited in 1999.
 
“Lack Toast and Taller Ant” was cited on Twitter on November 8, 2010. “Lack toast and toddler ant” was cited on Twitter on April 26, 2012.
 
   
Wikipedia: Lactose intolerance
Lactose intolerance is the inability of adults and children to digest lactose, a sugar found in milk and to a lesser extent dairy products, causing side effects. It is due to a lactase deficiency, or hypolactasia. In some (rare) cases, individuals have congenital alactasia, a total absence of lactase caused by a genetic defect, which prevents them from being able to digest lactose from infancy.
     
The Eggcorn Database
lactose » lack toast
Chiefly in:  lack toast intolerant , lack toast and tolerant
     
Google Groups: rec.games.trading-cards.magic.strategy
Just a little something in defense of AOLers:
Nick Blesch
2/6/97
In English class today, our teacher walked into the room and put this on the board: “Big Mistake of the Day: ...lack toast and tolerant ...”
 
Google Groups: alt.humor.puns
Puns of the Weak: 9-10-99
Stan Kegel
9/12/99
(...)
“Where’s my toast? Its not breakfast without toast.”
“I should have known you were lack-toast intolerant.”(From Lola)
 
Google Books 
The Language Report
By Susie Dent
Oxford: Oxford University Press
2006  
Pg. 109:
... horse, going at it hammer and thongs, and a parting of the waves, as well as new terms such as explanation mark, lack toast intolerant, and hack-kneed.
     
Google Books
The Ants Are My Friends:
Misheard Lyrics, Malapropisms, Eggcorns and Other Linguistic Gaffes
By Martin Toseland
London: Portico Books
2007
Pg. ?:
Lack toast and intolerant.
If you wake up in a bad mood, don’t get breakfast soon enough and are generally a complete pain, you can be described as ‘lack toast and intolerant’; if your body cannot break down lactose (the main sugar found in milk) you are lactose intolerant. I’m ‘lack toast and tolerant’ unfortunately.
 
The Huffington Post
The Ill-Advised Fight Against Malapropisms
Posted: 06/05/2008 5:12 am EDT Updated: 11/17/2011 9:02 am EST
Words By Mark Peters
(...)
I think my favorite is “lack toast and tolerant,” a dietary problem that makes lactose intolerance seem like a pleasant alternative to a barren, toastless existence.
 
Twitter
Dan Nold
‏@dancingcripples
Had my young son in for some medical tests.  When the diagnosis came, he texted his sister.  “I am lack toast and tolerant.”  😊
1:34 PM - 5 Apr 2009
   
Twitter
Stella
‏@thatsLastella
did you say milk and cookies ??? ahh i think i’ll past i’m lack-toast-n-taller-ant
8:19 PM - 24 Feb 2010
 
Twitter
Freckle Goddess
‏@WhoIsDommie
Lack Toast and Taller Ant
11:29 AM - 8 Nov 2010
 
Twitter
Lauren Conrad
‏@MarKatDiCap
@hey_layne lack toast and toddler ant
9:11 PM - 26 Apr 2012
 
Twitter
Baekwon
‏@danyellsoloud
Lack toast in toddler ant
6:02 PM - 6 Feb 2013
 
Twitter
Bo Wen Liu❦
‏@Escaped_Lunatic
@brieannaelliot Bet you can’t eat breakfast without toast because you’re lack-toast intolerant. #NoneOfThat #WeDontDoThatHere
10:38 AM - 15 Dec 2013
 
Google Books
There Are Tittles in This Title:
The Weird World of Words
By Mitchell Symons
London: Michael O’Mara Books Limited
2014
Pg. ?:
Lactose intolerant
‘I can’t eat dairy anymore. I think I’m lack toast and tolerant.’