“Why do girls float?”/“They’re boyn’t.”

“Buoyant” has nothing to do with “boy,” but “boyn’t” is a pun.
     
“Boys always sink but girls don’t because they’re boyn’t” was posted on Twitter by Ólafur Andri on June 30, 2018. “Why do girls float? They’re boyn’t” was posted on Reddit—Jokes on August 2, 2019.
   
“Why are girls so good at swimming?  Because they’re boyn’t” was posted on Twitter by Tess on May 4, 2020. “Why are girls so good at swimming? Because they are boyn’t” was posted on Reddit—Dadjokes on September 21. 2020.
   
“Trans girls float really well. They’re boyn’t” was posted on Twitter  by Bianca Haven, God-Queen on August 5, 2019. “Trans girl can never drown, they boyn’t” was posted on Twitter by winter on August 6, 2020.
 
       
Twitter
Ólafur Andri
@olafur1199
Boys always sink but girls don’t because they’re boyn’t.
7:53 PM · Jun 30, 2018·Twitter for Android
   
Reddit—Jokes
Posted by u/Avii112 August 2, 2019
Why do girls float
They’re boyn’t
 
Twitter
3AM
@3AM_Jokes
Why do girls float… They’re boyn’t
1:07 PM · Aug 2, 2019·IFTTT
   
Twitter 
Bianca Haven, God-Queen
@ThousandsOfBees
Trans girls float really well. They’re boyn’t.
11:16 AM · Aug 5, 2019·Twitter Web App
 
Twitter
Tess
@DaBessTess
Why are girls so good at swimming?
Because they’re boyn’t
7:16 PM · May 4, 2020·Twitter Web App
   
Twitter
rose struggle tweets
@longfromg
what do you call a girl who floats? boyn’t
9:04 PM · Jul 8, 2020·Twitter for Android
   
Twitter
winter
@winterbutontwt
trans girl can never drown, they boyn’t
8:02 PM · Aug 6, 2020·Twitter for Android
   
Twitter
Kikimora Simp
@ISwearOnSatan
Just a trans girl floating by
because she is boyn’t
3:04 PM · Aug 25, 2020·Twitter Web App
   
Twitter
Chris Ignition
@Twevara
Replying to @softlikemochi
(...)
Why was the girl so good at swimming
She was Boyn’t
4:19 PM · Sep 12, 2020·Twitter Web App
 
Reddit—Dadjokes
Posted by u/Tritoslp September 21, 2020
Why are girl so good at swimming?
Because the are boyn’t