The digestive biscuit originated in Scotland. There is no “indigestive biscuit,” but there are jokes.
   
“So…what do we have in the US…‘indigestive’ biscuits???” was posted on the newsgroup misc.consumers.frugal-living on May 22, 2002. “Indigestive Biscuits #badbiscuits” was posted on Twitter by Arabella Sock on October 22, 2010. “Indigestive Biscuits #failedbiscuits” was posted on Twitter by jim on July 9, 2013.
   
“if there’s digestive biscuits…. does that mean there’s indigestive biscuits 🤔😳” was posted on Twitter by 🎧 on September 5, 2020. “the existence of digestive biscuits implies the existence of indigestive biscuits that permanently clog up your colon” was posted on Twitter by exa on October 6, 2020. “digestive biscuits imply the existence of indigestive biscuits” was posted on Twitter by staryoshi06 on August 7, 2022.
   
     
WIkipedia: Digestive biscuit
A digestive biscuit, sometimes described as a sweet-meal biscuit, is a semi-sweet biscuit that originated in Scotland. The digestive was first developed in 1839 by two Scottish doctors to aid digestion. The term “digestive” is derived from the belief that they had antacid properties due to the use of sodium bicarbonate when they were first developed. Historically, some producers used diastatic malt extract to “digest” some of the starch that existed in flour prior to baking.
   
Google Groups: misc.consumers.frugal-living     
Thank you, Elana! (Off-topic)
Alpha Male
May 22, 2002, 1:23:02 PM
(...)
So…what do we have in the US…“indigestive” biscuits???
 
What unique ingredient is in those critters, to make them a _digestive_ biscuit….maybe ExLax…??? 😊
   
Twitter
Janette Dalgliesh 🌈 (she/her)
@CoachJanette
@timorene indigestive biscuit, perhaps?
2:51 AM · Nov 23, 2009·Twitter Web Client
 
Twitter
Brilliant Germ
@expatina
Indigestive Biscuits #oaptakeaway
6:16 PM · Jun 6, 2010·TweetDeck
   
Twitter
Liam
@Low_Brow
I really don’t like Indigestive biscuits :(
6:43 AM · Jul 15, 2010·Tweetie for Mac
 
Twitter 
Arabella Sock
@ArabellaSock
Indigestive Biscuits #badbiscuits
8:10 AM · Oct 22, 2010·TweetDeck
   
Twitter
jim
@jpndcf
Indigestive Biscuits #failedbiscuits
2:32 PM · Jul 9, 2013·Twitter for BlackBerry®
   
Twitter
John Dredge
@johndredge
not too keen on these new Indigestive biscuits.
4:54 PM · Jun 8, 2015·Twitter Web Client
     
Twitter
Jeff Ussher
@JeffUssher
Ingredients: Onion, chili powder, cayenne pepper, flour, capers, radish, jalapeños.
(Arnotts Indigestive Biscuits)
6:46 PM · Apr 8, 2017·Twitter Web Client
 
Twitter
🜏 R€V. JíM○⸸Hψ 𖤐
@JimothyScrivens
Indigestive Biscuits
#RejectedChristmasCookies
#ForMyUKPeeps
3:52 PM · Dec 6, 2017·Twitter for Android
     
Twitter
Wayne Hepner
@meamwayne
Indigestive Biscuit #RuinACookie
1:23 PM · Sep 5, 2018·Twitter Web Client
 
Twitter
the goblin queen’s hot little man
@fruitjerkie
Replying to @transscribe
digestive biscuits? as opposed to what??? indigestive biscuits you give your friends with allergies and then laugh at them when they can’t eat them??????
4:56 AM · Feb 16, 2019·Twitter Web Client
       
Twitter
ً🎧
@dazedbeom
if there’s digestive biscuits…. does that mean there’s indigestive biscuits 🤔😳
Quote Tweet
steph ᗢ
@hoshihoops
· Sep 5, 2020
Replying to @dazedbeom
I WAS JUST NAMING DIFFERENT BISCUITS WE HAVE
7:11 PM · Sep 5, 2020·Twitter for iPhone
 
Twitter
exa
@exaenae
the existence of digestive biscuits implies the existence of indigestive biscuits that permanently clog up your colon
11:22 AM · Oct 6, 2020·Twitter Web App
 
Twitter
staryoshi06 🛡
@staryoshi06
digestive biscuits imply the existence of indigestive biscuits
9:18 AM · Aug 7, 2022·Twitter Web App