“The first rule of mud wrestling is fight dirty”

The expression “fight dirty” means to engage an enemy using questionable tactics. It doesn’t usually involve dirt, but there are jokes.
 
“The first rule of mud wrestling is fight dirty” was posted on Twitter by juicymorsel on September 2, 2011. “FIRST RULE OF MUD WRESTLING - FIGHT DIRTY” (shown on a sign) was posted on Facebook by Indian Hills Community Sign on December 8, 2022.
 
     
Twitter
juicymorsel
@juicymorsel
The first rule of mud wrestling is fight dirty.
11:19 PM · Sep 2, 2011
     
Twitter   
The Senate
@KaoticXIII
RT @funnyoneliners: The first rule of mud wrestling is fight dirty.
RT @juicymorsel
9:16 AM · Sep 3, 2011
   
Twitter
@FTWes🥋🇺🇸🇺🇦
@FTWes
That’s the 2nd rule. The 1st rule is fight naked. RT @funnyoneliners: The first rule of mud wrestling is fight dirty.
10:16 AM · Sep 3, 2011
   
Twitter
Wrestling Authority
@NorvFernum
Some lady asked me for advice on becoming a wrestler. I told her “The first rule of mud wrestling is fight dirty.”! #ItsTrueItsDamnTrue
10:38 AM · Sep 30, 2012
 
Twitter
Susan Dey
@susandeyka
The first rule of mud wrestling is fight dirty.
4:56 AM · Nov 26, 2013
 
Twitter
Daniel Dickel
@1861_again
The first rule of mud wrestling: Fight dirty…
8:35 PM · Sep 3, 2017
 
Facebook
Indian Hills Community Sign
December 8, 2022 at 3:15 PM ·
(The following text is shown on a sign.—ed.)
FIRST RULE OF
MUD WRESTLING -
FIGHT DIRTY