“What do you call a temporary teacher fart?”/“A substitoot.”

“Substitute” is often jocularly spelled “substitoot.” A musical riddle was cited in print in 1882:
 
Q: What should a man be called who takes the place of another in a brass band?
A: A substitoot.
 
A “substitoot” can also be a farting substitute teacher.. “Replacement teacher farted that’s a substitoot” was posted on Twitter on September 3, 2015. A riddle was posted on the website The Amazingly Lame Joke of the Day on January 26, 2017:
 
Q: What do you call a temporary teacher fart?
A: A substitoot.
   
“What do you call a teacher who doesn’t fart in public?”/“A private tooter” is a related joke.
     
   
4 October 1882, Decatur (IL) Morning Herald, pg. 2, col. 3:
What should a man be called who takes the place of another in a brass band? A substitoot.
 
10 March 1892, Concordia (KS) Empire, pg. 4, col. 7:
Flats: You are not playing with the band to=day? Sharps: No: I sent a substitoot.
 
Twitter
Casey
‏@FaZeSwan
@Ahdapting same bro. I has histery right naow and there are a substitoot teacher and i’m have a lot of boredness and want to sleep
10:43 AM - 28 Nov 2012
 
Twitter
Nick Kennedy
‏@nickennedy10
Replacement teacher farted that’s a substitoot #RapLikeLilWayne
9:23 PM - 3 Sep 2013
 
Twitter
Cameron Jesseph
‏@CameronJesseph
That sub stunk because she was a substiTOOT
9:59 AM - 17 Dec 2013
 
Twitter
Connor Searle
‏@connorhea
Our sub in chemistry passed gas, call that a substiTOOT. #RapLikeLilWayne
1:20 PM - 18 Mar 2014
 
Twitter
Pun Queen
‏@ourdailypun
What do you call a professor who struggles with gas? A substitoot teacher.
10:20 AM - 2 Apr 2015
 
The Amazingly Lame Joke of the Day
Thursday, January 26, 2017
What do you call a temporary teacher fart?
A substitoot.
Posted by Tim Wycislak at 5:15 AM