Definitely "mama mia". "Mamma" just doesn't look right to me.
Super Mario Boards
I'm the lil bro.
Mario4Ever
I'd opt for the latter, but I think it's like Wario's use of German in that it's such a minor aspect of the character (so far) that being pedantic doesn't really accomplish anything.
Meta Knight
The latter because that's how the ABBA song is spelt
Galaxy Book Sunshine
I'd say "mamma" partially because of this video:
youtu.be
And that I hear Mario himself saying "mamma" in one of the SM64's voice clips.
MAMMA MIA - How to Use and Pronounce it Like a True Italian
"Mamma mia" is an italian expression which denotes various kind of emotions: surprise, fear, rejection, joy...It literally means "My mother".It is a catchphr...
youtu.be
Nate Jacobs
MAMA MIA! A WOODEN BOY! (Cat shoots Pinocchio)
Toadettefan
I prefer "Mama mia"