It means that you've gotten a 1-star rating on every cup. This rating will be displayed to players online during online matches.
You have to win all races in 1st place.
You either do something with Super Mario Galaxy or if you don't have Super Mario Galaxy(like me), all you have to do is get at least get a 1 star rating for every cup/cc.
go alright
Step 1. Record yourself getting a star rank in Mario Kart Wii. Step 2. Upload recording to Youtube.
The ranks for Mario Kart are: E,D,C,B,A,1 star,2 stars,&,3 stars.
Earn 1 star in all Mirror Cups
get at least 1 star rank
I don't know for sure, but I hear you get it by getting 100 streetpass tags in Mario kart 7.
Get a 1-star rank or higher on every Grand Prix.
Get a 1 star rank or more in the 50cc wii cup
1 Star in all 50cc Wii-Cups
By being very good at it!