“What do you call a Mexican drowning in mayonnaise?”/“Sinko de Mayo.”

A popular Cinco de Mayo riddle is:
 
Q: What do you call a Mexican drowning in mayonnaise?
A: Sinko de Mayo.
 
The Cinco/Sinko de Mayo pun was posted on Twitter on November 26, 2012.
 
   
Wikipedia: Cinco de Mayo
Cinco de Mayo (pronounced: [ˈsiŋko ðe ˈmaʝo]; Spanish for “Fifth of May”) is a celebration held on May 5. The date is observed to commemorate the Mexican Army’s unlikely victory over French forces at the Battle of Puebla on May 5, 1862, under the leadership of General Ignacio Zaragoza.

In the United States, Cinco de Mayo has taken on a significance beyond that in Mexico. In the U.S. the date has become associated with the celebration of Mexican-American culture. In Mexico, the commemoration of the battle continues to be mostly ceremonial, such as through military parades.
   
Twitter   
Nathan Zaru‏
@yes
Replying to @ikesplace
@ikesplace Also, you should make a sandwich called the “Cinco de Mayo”—5 kinds of meat drowning in mayonnaise
12:41 AM - 17 Jan 2012
 
Twitter
Pablo ☸‏
@SaintPablo93
what do you call a group of Hispanics drowning in mayonnaise????
Cinco de mayo!! lmao *slaps knee
11:11 AM - 26 Nov 2012
 
Twitter
Lavender‏
@_JustCharlieb
What do you call a group of Mexicans drowning in mayonnaise?
Cinco de mayo
Lmao
9:37 PM - 26 Nov 2012
 
Twitter
Romey Rome‏
@CKJAY619
What do you call a group of MEXICANS drowning in Mayonnaise???
*CINCO DE MAYO!!.......haha
11:31 AM - 27 Nov 2012
   
All Informal
May 22, 2016
FUNNY MEXICAN JOKES FROM A MEXICAN? CMON!
EMMA GAVIN   11:17 AM   ENTERTAINMENT , JOKES
(...)
What do you call a Mexican drowning in mayonnaise?
Sinko De Mayo.
 
Twitter
LeeKirbyDitko‏
@StrangeNerd100
#racism #jokes #1pun
Q: What do you call a Mexican drowning in mayonnaise?
A: Sinko De Mayo.
8:36 AM - 26 Apr 2017