0947
0947 is a running gag, invented by a video producer group called scurr crew. A producer called Uhso wanted to record Stardew Valley, but for some reason it didn't really worked out well. After a while he wanted to add his partner Qfuu on his Nintendo Switch friendlist, so he gave Qfuu the code. Qfuu (a true man of culture) repeated: Null neun vier sieben!

Everybody liked that and started to comment 0947. Now its all over german nintendo youtube twitter
Qfuu: 0947!
Everybody: *laughs*