This week: Dimension X #3. Just...all of it.
Teenage Mutant Ninja Turtles: Dimension X (2017) is exactly what it sounds like - a miniseries about the Turtles traveling through Dimension X. In issue 3 (August 2017), they come across a wrestling planet run by two aliens named Stump and Sling...
...get roped into a wrestling competition where Leonardo dresses like a samurai and they fight an alien named Cryin' Houn'...
...Michelangelo wrestles a creature named Antrax the Executioner...
...and Michelangelo uses the word "cowabunga!"
This whole story is a reference to Teenage Mutant Ninja Turtles Adventures #7 (December 1989), where Cudley the Cowlick takes the Turtles to a Dimension X wrestling planet run by Stump and Sling...
...get roped into a wrestling competition where Leonardo dresses like a samurai...
...and their match is against an alien named Cryin' Houn' (who, admittedly, is much different in this version).
As for Antrax, he is a denizen of Dimension X that appeared in the toyline in 1991 as Krang's executioner. He has also appeared in the 80s cartoon and other adaptations, but he's different in each of them.
As for "Cowabunga!", that's a word famously used by the Turtles in the 80s cartoon, and the comics' Turtles at the time would never have been caught dead saying it.