Super Mario fans believe that "Mamma Mia" has been replaced by "Wowie Zowie."
The fans of Super Mario are of the opinion that one of the most famous catchphrases of the mustachioed plumber, namely "Mamma mia," has been replaced ...

The fans of Super Mario are of the opinion that one of the most famous catchphrases of the mustachioed plumber, namely "Mamma mia," has been replaced with "Wowie Zowie" in Super Mario Bros. Wonder.
Already in the very first trailer for Super Mario Bros. Wonder, it became apparent that the game aims to differentiate itself significantly from the other recently released 2D Mario games. It not only eschews the simpler style employed in the "New" series of games but also introduces features such as Wonder Seeds that make the gameplay incredibly psychedelic and peculiar. In conjunction with the new Elephant Power-Up, Wonder creates the impression of being far removed from the realm of the "New" games.
As unique as Super Mario Bros. Wonder appears in comparison to the rest of the series, the most significant change of all is that Charles Martinet will no longer voice Mario and Luigi. This means that the duo will sound slightly different this time around. That alone was strange enough, but some fans believe that an even greater change is on the horizon and that one of the series' most famous catchphrases could be replaced.
ResetEra user Birdie pointed out that the previously showcased footage of Super Mario Bros. Wonder prominently features the phrase "Wowie Zowie," particularly when a character transforms into an elephant. Birdie speculates that this could be a new catchphrase for the series, possibly attempting to replace "Mamma mia," which some have viewed as stereotypical in the past.
Interestingly, we haven't actually heard the expression "Mamma mia" in Super Mario Bros. Wonder thus far. Granted, we haven't seen too much footage of the game yet, but in every snippet we've witnessed, neither Mario nor Luigi have uttered it, which is a bit peculiar considering how frequently it appeared in previous games.
To make things even more interesting, Birdie also pointed out that this isn't the first Mario game attempting to introduce "Wowie Zowie," as it was actually used in the opening sequence of Luigi's Mansion 3. As Luigi exits the bus and gazes up at the mansion, he exclaims "Wowie Zowie" in sheer awe. If you ask me, that would have been the perfect moment to drop a "Mamma mia" from Luigi, which could suggest that it's being replaced.
It should be noted that these are mere speculations, and we haven't seen enough of Mario Wonder to be certain if "Mamma mia" has indeed been omitted. However, one thing is certain: Nintendo is definitely attempting to establish "Wowie Zowie," even if it doesn't necessarily have to replace "Mamma mia."