The 2019–20 coronavirus pandemic caused many people to wear face masks. The bikini, with a face mask, became a “triquini” (tri- + quarantine + bikini).
   
Posts on Twitter by arantwitno on April 14, 2020, and on Twitter by Alberto velazquez de castro on April 15, 2020, both show a “triquini.”
   
“Trikini” is another spelling.
     
   
Wikipedia: 2019-20 coronavirus outbreak
The 2019–20 coronavirus pandemic is an ongoing global pandemic of coronavirus disease 2019 (COVID-19), caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). The outbreak was first identified in Wuhan, Hubei, China, in December 2019, and was recognised as a pandemic by the World Health Organization (WHO) on 11 March 2020.
 
Wikipedia: Bikini
A bikini is typically a women’s two-piece swimsuit featuring two triangles of fabric on top, similar to a bra and covering the woman’s breasts, and two triangles of fabric on the bottom, the front covering the pelvis but exposing the navel, and the back covering the buttocks. The size of the top and bottom can vary from full coverage of the breasts, pelvis, and buttocks, to more revealing designs like a thong or G-string that cover only the areolae and mons pubis, but expose the buttocks.
       
Twitter
arantwitno
@Tarantwitno
Moda baño verano 2020. Vuelve el triquini.
(A photo is shown.—ed.)
2:21 PM · Apr 14, 2020·Twitter for Android
   
Twitter
Alberto velazquez de castro
@Albertovc20
Pues este es el triquini de moda de este año!Smiling face with open mouth and cold sweat
1:02 PM · Apr 15, 2020·Twitter for iPhone
   
Twitter
M. Royo #JoAcuso
@royo1_royo
Noies el tríquini del estiu 2020!!
1:07 PM · Apr 15, 2020·Twitter for iPhone
 
Facebook
Simona Velčić
April 16, 2020 at 2:36 PM ·
Triquini?!😲No thnx😶
(“Triquini 2020” is shown.—ed.)
 
Facebook
Lynda Maguire
April 16, 2020 at 3:41 PM ·
Who wants a triquini for 2020 🤣😜😷🌞
(“Triquini 2020” is shown.—ed.)
 
Facebook
Crazy World
April 16, 2020 at 5:14 PM ·
(“Triquini 2020” is shown.—ed.)
     
Twitter
Joshua Ortega
@JoshuaOrtega88
Trikini, Triquini…this is something else, what! Flushed faceHigh voltage signHigh voltage signHigh voltage sign
3:45 PM · Apr 25, 2020·Twitter for iPhone
 
Twitter
Carl Kittrell
@Cjkittrell
Summer 2020 fashion takes an interesting turn. Introducing the Triquini 2020!
https://reddit.com/r/WhitePeopleTwitter/comments/g9ozsr/the_new_summer_pool_look_the_triquini/?utm_source=share&utm_medium=ios_app&utm_name=iossmf
The NEW summer pool look! The Triquini!
Posted in r/WhitePeopleTwitter by u/poestavern • 2 points and 0 comments
reddit.com
11:42 AM · Apr 28, 2020 from Benicia, CA·Twitter for iPad