“Syruptitiously” is a portmanteau of the words “syrup” and “surreptitiously.” “Pass the Log Cabin, said Tom syruptitiously” is a Tom Swifty that was posted on the newsgroup rec.humor on June 19, 1990. ““How do you eat those fattening pancakes?”/“Syruptitiously” was printed in the Wall Street Journal (New York, NY) on April 14, 1994.
 
This joke was posted on the website Pun of the Day on June 25, 2014:
 
“What’s the best way to serve a stack of puncakes? Syruptitiously.”
   
   
Google Groups: rec.humor
TomSwiftisms
Jay Wooten
6/19/90
Pass the Log Cabin, said Tom syruptitiously.
         
14 April 1994, Wall Street Journal (New York, NY), “Pepper…and Salt,” pg. A15:
Sweet Talk
“How do you eat those fattening pancakes?”
“Syruptitiously.”
—Alan Y. Pope.
 
Google Groups: alt.humor.puns
“Puns of the Weak” 12/08/00
Stan Kegel
12/9/00
(...)
“I was born and raised in a log cabin,” said Tom syruptitiously. (Don Kirkman)
 
Twitter
Steve Delfino 🔩 🏳️‍🌈
@SteveDelfino
How do you steal pancakes from IHOP? Syruptitiously.
1:59 AM - 2 Aug 2009
   
Twitter
Ysabel
@Ysabeluna
RT @languagenhumor He liked International House of Pancakes so much he stole their maple topping—syruptitiously.  (surreptitiously)
3:38 AM - 10 Mar 2010
   
Twitter
Henry Birdseye
@tehawesome
I eat pancakes under my desk syruptitiously.
10:52 AM - 5 May 2010
   
Twitter
The Pun Gents
@pungents
My pancake maker was stolen, syruptitiously. What a waffle experience - I feel like I’ve been creped. Who will s… http://bit.ly/efP6zk
2:01 AM - 9 Dec 2010
     
Pun of the Day (June 25, 2014)
What’s the best way to serve a stack of puncakes? Syruptitiously.
Category - Kinds of Food
Submitted by - Dr. Pun -
 
Twitter
Belarmino Larose
@Belarminojji
What’s the best way to serve a stack of puncakes? Syruptitiously.[Click to Vote!]
3:01 AM - 25 Jun 2014
   
Twitter
Greg Ross
@WhitbyGreg
What’s the best way to serve a stack of puncakes? Syruptitiously. http://www.punoftheday.com/pun/4656
7:43 AM - 25 Jun 2014
 
Twitter
Georgie Libbie
@GeorgieGurl
What’s the best way to serve a stack of puncakes?  Syruptitiously.
5:43 PM - 16 Mar 2016
   
Twitter
Real Food Daily
@RealFoodDaily
What’s the best way to serve a stack of pancakes? Syruptitiously.
#SundayBrunch
1:15 PM - 1 May 2016
   
Twitter
Ryan’s Ruminations
@Ryan__Hyman
My dietitian doesn’t let me have any toppings on my pancakes so if I add anything I have to do it syruptitiously.
7:21 PM - 3 Jan 2018
 
Twitter
Steven W Skinner
@SkinnerSteven
I poured some extra Aunt Jemima on my pancakes syruptitiously
10:30 AM - 2 Feb 2019
 
Twitter
Ralph Nelson Willett
@NorthernOvation
Q: What’s the best way to serve a stack of puncakes?
A: Syruptitiously.
9:45 AM - 29 Mar 2019
 
Reddit—Dadjokes
Posted by u/3copenhaver April 3, 2019
How do maple trees tell secrets?
Syruptitiously.