“An opinion without 3.14 is just an onion”

“An opinion without 3.14 is (just) an onion” is a math joke that has been printed on many images. The word “opinion” has “pi” in it.
 
“‘An OPINION without 3.14 is just an ONION.’ http://tmblr.co/ZfBcHyDFKGPx” was posted on Twitter by Desy Kristianti on December 14, 2011. The saying probably originated on tumblr.
 
     
Wikipedia: Pi
The number π (/paɪ/) is a mathematical constant. Originally defined as the ratio of a circle’s circumference to its diameter, it now has various equivalent definitions and appears in many formulas in all areas of mathematics and physics. It is approximately equal to 3.14159. It has been represented by the Greek letter “π” since the mid-18th century, though it is also sometimes spelled out as “pi”. It is also called Archimedes’ constant.
       
Twitter
Desy Kristianti
@dessskris
“An OPINION without 3.14 is just an ONION.” http://tmblr.co/ZfBcHyDFKGPx
9:58 AM · Dec 14, 2011·Tumblr
   
Twitter
Sebastian Kole
@SebastianKole
This is hilarious! “@RonQuixote_ “An opinion without 3.14 is just an onion” smh…fake deep”
3:26 PM · Dec 14, 2011·Plume for Android
   
Twitter
keeda
@beinghorny
An Opinion without 3.14 is an Onion
4:08 AM · Jan 13, 2012·TweetDeck
   
Twitter
yepicurious
@yepicurious
Seriously geeky!! XD XD RT@ramblinggeek An Opinion without 3.14 is an Onion
4:42 AM · Jan 13, 2012·Twitter Web Client
 
Twitter
Yik Yak
@YikYakApp
“An opinion without 3.14 is just an onion…” — Glasgow
1:58 AM · Jul 5, 2015·Buffer
 
Twitter
Bob Kostic
@causticbob
If you get this, RT. If not, Like. Don’t spoil it for other.
An opinion without 3.14 is an onion.
5:16 PM · May 5, 2016·Twitter Web Client
     
Reddit—Oneliners 
Posted by u/tomh1982 March 20, 2017
An opinion without 3.14 is just an onion
 
Twitter
Shower Thoughts
@TheWeirdWorld
An opinion without 3.14 is an onion.
12:01 AM · Sep 13, 2018·Buffer
 
Reddit—Dadjokes
Posted by u/Nikoklis February 3, 2020
What is an opinion without 3.14?
An onion.